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2a - 4b + 3c + 3a + 3b - 2c
= 2a + 3a - 4b + 3b + 3c - 2c
= 5a - b + c
3a+3b-2c
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(2a+3a)+(-4b+3b)+(3c+(-2c))
(2+3)a+(-4+3)b+(3-2)c
5a-b+c