-3 (x+2y) - (3x+4y) - (2x-2y)

removing of grouping symbols
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??????????? "remueving av..." ???????????? -3(x+2y) -(3x+4y) -(2x-2y)... =-3x -6y -3x -4y -2x +2y... =(-3x -3x -2x) + (-6y -4y +2y)... =-8x -8y... or -8(x+y)
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