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x^2-xy=10 xy-y^2=20 (x^2-xy)+(xy-y^2)=30 x^2-y^2=30 x^2-xy=10 xy-y^2=20 (x^2-xy)-(xy-y^2)=x^-2xy+y^2=-10 x^-2xy+y^2=-10
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