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x(3xy-y)-y(x²-xy+x)=3x²y-xy-x²y+xy²-xy=2x²y-2xy+xy²=xy(2x-2+y)
-1*1/5(2*(-1)-2+1/5)=-1/5(-2-2+1/5)=-1/5(-4+1/5)=-1/5(-3 i 4/5)=
=-1/5*(-19/5)=19/25