| 3a |
| a-b |
| a+b |
| a-b |
| 3a-2b |
| b-a |
| 3a |
| a-b |
| a+b |
| a-b |
| 3a-2b |
| a-b |
| 3a-a-b+3a-2b |
| a-b |
| 5a-3b |
| a-b |
| a |
| (a-b)2 |
| a |
| (b-a)2 |
| b |
| (a-b)3 |
| b |
| (b-a)3 |
| 4x2-y2 |
| x2-4y2 |
| (2x-y)2 |
| x2-4y2 |
| 2y2-4xy |
| 4y2-x2 |
| 4 |
| x2-1 |
| x+1 |
| x-1 |
| 2x2+1 |
| x2-5x+6 |
| x2-1 |
| x2-5x+6 |
| 4-5x |
| x2-5x+6 |
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