| x+2y-z |
| x-y+3z |
| 4 |
| 11 |
| 4 |
| 11 |
| 1 |
| 2 |
| b |
| c |
| a-b |
| a |
| b-c |
| b |
| c-a |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| a |
| 1 |
| b |
| 1 |
| 2 |
| 2a-ab-2b |
| a-3ab-b |
| 4 |
| 7 |
| 4 |
| 7 |
| a |
| b |
| 2 |
| 3 |
| a2-3ab-b2 |
| a2-2ab+b2 |
| 3x-3 |
| x2-1 |
| 3x |
| x+1 |
| 1 |
| x-1 |
| 1 |
| 2 |
| 1 |
| 2 |
| a |
| a+b |
| b |
| a-b |
| a2 |
| a2-b2 |
| 9 |
| 7 |
| 9 |
| 7 |
| x-2y |
| x+3y |
| 1 |
| 11 |
| 1 |
| 11 |
| |x| |
| x |
| |xy| |
| xy |
| x4-y4 |
| x2-2xy+y2 |
| x2+y2 |
| y-x |
| 1 |
| 2 |
| 2a2-2 |
| a-1 |
| m2-16 |
| 3m-12 |
| m+4 |
| 3 |
| m+4 |
| 3 |