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= 3xy - 12x - 4x - 2xy
= 3xy - 2xy - 12x - 4x
= xy - 16x
b. 3(3xy -12x) + 4(2x + xy)
= 9xy - 36x + 8x + xy
= 9xy + xy - 36x + 8x
= 10xy - 28x
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