2(x+y) -5(x+y)+4(x+y)= 2x+2y-5x-5y+4x+4y=x+2y-5y+4y= x+y
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2(x+y) -5(x+y)+4(x+y)= 2x+2y-5x-5y+4x+4y=x+2y-5y+4y= x+y