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= 2(a - b + c) - 3(2a + b - c)
= 2a - 2b + 2c - 6a - 3b + 3c
= - 4a - 5b + 5c
= 2 (a - b + c) - 3 (2a + b - c)
= 2a - 2b + 2c - 6a - 3b + 3c
= -4a - 5b + 5c