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algebra
simplify the expressions
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| A | B |
|---|
| 3k +8k + 4k | 15k |
| 3ab + 4a + 8ab - 2a + 6a - 5ab | 6ab +8a |
| 8k + 5k - 3k | 10k |
| 6ab + 9a - 5ab - 5a + 6ab | 7ab +4a |
| 3x + 4z - 8x + 3y - 8z +7y | -5x -4z + 10y |
| a + b - 2a + 3b | -a + 4b |
| 8c - 3d - 8f + 12d + 7f - 6c | 2c +9d -f |
| -9a + 3b - 6d -3a -8b + 10d | -12a - 5b +4d |
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