| x + x | 2·x = 2x |
| y + y + y + y | 4·y = 4y |
| z + z + z | 3·z = 3z |
| b + b + b + b | 4b |
| x + x + x |
3x |
| 3x + 4x | 7x |
| 3x + x | 4x |
| 2y + 3y + y | 6y |
| z + 9z | 10z |
| 4x + x + 5x | 10x |
| 8y - 5y | 3y |
| 3z - 5z | -2z |
| 2x - 5x | -3x |
| y - 4y | -3y |
| x + x | 2·x = 2x |
| y + y + y + y | 4·y = 4y |
| z + z + z | 3·z = 3z |
| b + b + b + b | 4b |
| x + x + x |
3x |
| 3x + 4x | 7x |
| 3x + x | 4x |
| 2y + 3y + y | 6y |
| z + 9z | 10z |
| 4x + x + 5x | 10x |
| 8y - 5y | 3y |
| 3z - 5z | -2z |
| 2x - 5x | -3x |
| y - 4y | -3y |