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-2x-4y+3x-3y
-2x+3x-4y-3y
x-7y
4(2a-b)-2(a+3b)
8a-4b-2a-6b
8a-2a-4b-6b
6a-10b
-3(4x-y2)+3(2x-5y2)
-12x-3y2+6x-10y2
-12x+6x-3y2-10y2
-6x-13y2