-2(x2-y2+xy)-3(x2+y2-xy)
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6
-2x2+2y2-2xy-3x2-3y2+3xy
-5x2-y2+xy ans
-5x2-y2+xy ans
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-4x+4y-2xy-6x-6y+3xy -10x-2y+xy
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