Step by Step Problems No.7/Answer

Step 0              Step 1              Step 2              Step 3              Step 4
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |       |   |       |       |   |       |       |   |XXX|XXX|       |   |       |XXX|XXX|
+       +---+---+   +       +---+---+   +       +---+---+   +---+---+---+---+   +---+---+---+---+
|       |       |   |       |       |   |       |       |   |       |       |   |       |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +       +---+---+   +       +---+---+
|   |   |XXX|XXX|   |   |XXX|XXX|   |   |XXX|XXX|   |   |   |       |   |   |   |       |   |   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |
+   +   +---+---+   +   +   +---+---+   +   +   +---+---+   +   +   +---+---+   +   +   +---+---+
|   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+

Step 5              Step 6              Step 7              Step 8              Step 9
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |       |   |       |       |   |       |       |   |       |       |   |       |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |XXX|XXX|   |       |XXX|   |   |XXX|       |   |   |   |       |   |   |   |       |   |
+       +---+---+   +       +---+---+   +---+       +---+   +   +       +---+   +   +       +---+
|       |   |   |   |       |XXX|   |   |XXX|       |   |   |   |       |   |   |   |       |   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |   |       |   |   |   |       |   |   |   |       |   |XXX|   |       |   |   |XXX|       |
+   +   +---+---+   +   +   +---+---+   +   +   +---+---+   +---+   +---+---+   +   +---+---+---+
|   |   |       |   |   |   |       |   |   |   |       |   |XXX|   |       |   |   |XXX|       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+

Step 10             Step 11             Step 12             Step 13             Step 14
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |       |   |       |       |   |       |       |   |       |       |   |       |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |       |   |   |   |       |   |   |   |       |   |   |   |       |XXX|   |   |XXX|       |
+   +       +---+   +   +       +---+   +   +       +---+   +   +       +---+   +   +---+       +
|   |       |   |   |   |       |   |   |   |       |XXX|   |   |       |XXX|   |   |XXX|       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |       |XXX|   |   |       |XXX|   |   |       |XXX|   |   |       |   |   |   |       |   |
+   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+
|   |XXX|       |   |   |       |XXX|   |   |       |   |   |   |       |   |   |   |       |   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+

Step 15             Step 16             Step 17             Step 18             Step 19
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |       |   |       |       |   |       |       |   |       |       |   |       |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|XXX|   |       |   |XXX|   |       |   |XXX|   |       |   |XXX|   |       |   |XXX|   |       |
+---+   +       +   +---+   +       +   +---+   +       +   +---+   +       +   +---+   +       +
|XXX|   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |
+---+---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+   +   +---+---+---+
|   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |XXX|
+   +---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|   |       |   |   |XXX|       |   |   |       |XXX|   |   |       |   |XXX|   |       |   |   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+

Step 20             Step 21             Step 22             Step 23             Step 24
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |       |   |       |       |   |XXX|XXX|       |   |       |XXX|XXX|   |       |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+       +
|XXX|   |       |   |XXX|XXX|       |   |       |       |   |       |       |   |       |       |
+---+   +       +   +---+---+       +   +---+---+       +   +---+---+       +   +---+---+---+---+
|   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |XXX|XXX|
+   +---+---+---+   +   +   +---+---+   +   +   +---+---+   +   +   +---+---+   +   +   +---+---+
|   |XXX|       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+
|       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |   |       |   |   |
+---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+   +---+---+---+---+