| x + x | = | 2x |
| 2x + x | = | 3x |
| x + 2x | = | 3x |
| 2x + 2x | = | 4x |
| 3x + 2x | = | 5x |
|
| x + x + x | = | 3x |
| 2x + x + x | = | 4x |
| 2x + 2x + x | = | 5x |
| 2x + 2x + 4x | = | 8x |
| 4x + 3x + 2x | = | 9x |
|
Other letters may be used
| a + a | = | 2a |
| 2b + b | = | 3b |
| 4c + 2c | = | 6c |
| 5y + 3y | = | 8y |
| 2z + z | = | 3z |
|
| w + w + w | = | 3w |
| 2g + 2g + g | = | 5g |
| 4t + 3t + 2t | = | 9t |
| v + 2v + 3v | = | 6v |
| 5q + 3q + 2q | = | 10q |
|
With different letters
| x + x + y | = | 2x + y |
| y + y + z | = | 2y + z |
| 2w + w + s | = | 3w + s |
| r + 3r + 2t | = | 4r + 2t |
| a + b + 2a | = | 3a + b |
|
With negatives
| 3x - x | = | 2x |
| 4y - y | = | 3y |
| 7w - 2w | = | 5w |
| 9r - 4r | = | 5r |
| 22w - 3w | = | 19w |
|
| - 3x - x | = | - 4x |
| - 4y - y | = | - 5y |
| - w - 6w | = | - 7w |
| - r - 2r | = | - 3r |
| - 2p - 3p | = | - 5p |
|
| 5x + 3x - x | = | 8x - x |
| | = | 7x |
| 3u + 4u - u | = | 7u - u |
| | = | 6u |
| 8y + 9y - 2y | = | 17y - 2y |
| | = | 15y |
|
With negatives
and different letters
| 5x - x + y | = | 4x + y |
| 2y + y - z | = | 3y - z |
| 6u - 2u + v | = | 4u + v |
| r - 3r + 8t | = | - 2r + 8t |
| - w - 2w + 3y | = | - 3w + 3y |
|
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