x-6y+5y=x-y(5+6)=x-y*11; x=5, y=0.89
5-0.89*11=5-9.79=-4.79
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x-6y+5y=x-y(5+6)=x-y*11; x=5, y=0.89
5-0.89*11=5-9.79=-4.79