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2. A - 2B = (3xy - 12x) - 2(2x + xy) = (3xy - 12x) - (4x + 2xy) = xy - 16x
3. 3A + 4B = 3(3xy - 12x) + 4(2x + xy) = 9xy - 36x + 8x + 4xy = 13xy - 28x