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