a) -3x+(-6x+y)-(-y+2x)=-3x-6x+y-y-2x= -11x+y-y= -11* (-1)-2-2=-11-2=-13
b) 4ab-(2a-3ab)+(-ab+4a)=4ab-2a-3ab-ab+4a=4ab-3ab-ab-2a+4a=0ab+2a=2*2=4
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a) -3x+(-6x+y)-(-y+2x)=-3x-6x+y-y-2x= -11x+y-y= -11* (-1)-2-2=-11-2=-13
b) 4ab-(2a-3ab)+(-ab+4a)=4ab-2a-3ab-ab+4a=4ab-3ab-ab-2a+4a=0ab+2a=2*2=4