subtract 4x - 7xy + 3y + 12 from 12x -9xy + 3y - 3
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12x - 9xy + 3y - 3 - ( 4x - 7xy + 3y + 2)
=12x - 9xy + 3y - 3 - 4x + 7xy - 3y - 2
= 8x - 2xy - 5
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