| 4y |
| 5x |
| 2y |
| 5x |
| 8y2 |
| 9x2 |
| 4 |
| x |
| 5 |
| x |
| 4 |
| x |
| x |
| 5 |
| 4 |
| 5 |
| 2a-4 |
| 2a-5 |
| 5a-8 |
| 5-2a |
| (2a-4)-(5a-8) |
| 2a-5 |
| 4-a |
| 2a-5 |
| 1 |
| x+1 |
| 1 |
| x-1 |
| x-1-(x+1) |
| (x+1)(x-1) |
| 2 |
| x2-1 |
| 1 |
| a-1 |
| a |
| a-1 |
| 32 |
| 3-n |
| n2 |
| 3-n |
| x+3 |
| x+2 |
| 2-x |
| x2-4 |
| (x+3)(x-2) |
| x2-4 |
| x-2 |
| x2-4 |
| x2+x-6-x-2 |
| x2-4 |
| x2-8 |
| x2-4 |
| x+3 |
| x+2 |
| x-2 |
| (x+2)(x-2) |
| x+3 |
| x+2 |
| 1 |
| x+2 |
| x+3-1 |
| x+2 |
| b2 |
| 2n-b |
| fn2 |
| b-2n |
| 1 |
| m+1 |
| 1 |
| m(m+1) |