| x |
| x-5 |
| x-2 |
| x-6 |
| 1 |
| 4-x |
| 5-x |
| x-4 |
| 2 |
| x+3 |
| 3 |
| 2 |
| 7 |
| 2x+6 |
| a2-1 |
| a2+4a+4 |
| a+1 |
| a+2 |
| x-1 |
| x-2 |
| 1 |
| 2-x |
| 7 |
| x-2 |
| 5 |
| x |
| 5x-5 |
| x-5 |
| jx-j |
| x-5 |
| x |
| x-2 |
| 6 |
| x+2 |
| 1 |
| x-1 |
| 1 |
| x+1 |
| x |
| 2x2-2 |
| 2 |
| x |
| x-y |
| 2y |
| x-y |
| xy |
| x-2y |
| 1 |
| x |
| 1 |
| y |
| 4 |
| 1 |
| 2 |
| 2 |
| x+1 |
| x-1 |
| 4 |
| x2-1 |
| x |
| x-1 |
| 3 |
| 2x-2 |
| 1 |
| 2x-4 |
| 1 |
| 2 |
| 3 |
| 2-x |
| x-2 |
| x+2 |
| 16 |
| x2-4 |
| x-8 |
| x-7 |
| 1 |
| 7-x |
| 1 |
| 9 |
| 1 |
| x |
| 1 |
| c |
| 1 |
| c |
| 2 |
| x |
| 2 |
| c |
| 2 |
| c |
| 3 |
| x |
| 3 |
| c |
| 3 |
| c |
| m |
| x |
| m |
| c |
| 2 |
| x-1 |
| 2 |
| a-1 |