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