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= -3a - b + 6 - a
= -4a - b + 6
B. -8x + y - (2x - 7y)
= -8x + y - 2x + 7y
= -10x + 8y
C. -(3a + 1) + (a - 1)
= -3a - 1 + a - 1
= -2a - 2