| a |
| b |
| 2 |
| 3 |
| a+2b |
| a-3b |
| 8 |
| 7 |
| 8 |
| 7 |
| 1 |
| x |
| 1 |
| y |
| 2x-14xy-2y |
| x-2xy-y |
| 8 |
| 7 |
| a |
| b |
| 2 |
| 3 |
| 2k+6k |
| 2k-9k |
| 8k |
| -7k |
| 8 |
| 7 |
| 1 |
| x |
| 1 |
| y |
| y-x |
| xy |
| 2(x-y)-14xy |
| x-y-2xy |
| -6xy-14xy |
| -3xy-2xy |
| -20xy |
| -5xy |
| m2-n2 |
| mn |
| 1 |
| m+n |
| 1 |
| m-n |
| n |
| m2-n2 |
| 2mn+n2 |
| m2 |
| 1 |
| a2 |
| 1 |
| a |
| 1 |
| a |
| 1 |
| a2 |
| 1 |
| a |
| y4 |
| y8-3y4+1 |
| x2+4x+4 |
| x+2 |
| 2 |
| a |
| a2-3a |
| 2a |
| a2-9 |
| a-2 |
| a2+6a+9 |
|