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b).-xz+xy+xz-yz=xy-yz
c). -10x+5xy-5xy-y-10xy+10x= -10xy-y
-x(z-y)-z(-x+y)=-xz+xy-zx-zy=-2zx+xy-zy
-5x(2-y)-y(5x+1)+10x(-y+1)=-10x+10xy-5xy-y-10xy+10x= -5xy-y