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10^2/2-10 (x+y)+x^2+y^2 = 10^2/2 x^2-10 (x y) y^2 50 = 50
10^2/2-10 (x+y)+x^2+y^2 = 10^2/2 x^2-10 (x y) y^2 50 = 50
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