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= 3x - 4y - 2y + 6y
= 3x
B. -x2 - 5x + 1 + 4x2 - x - 7
= - 3x2 - 6x - 6
C. 3a - 2ab + 4 + ab + 1 - 8a
= - 5a + ab + 5
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