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solve e^(x-y) * (x^2 + 2x - 2y^2) = 0 , e^(x-y) * ( -x^2 +2y^2 - 4y) = 0
solve e^(x-y) * (x^2 + 2x - 2y^2) = 0 , e^(x-y) * ( -x^2 +2y^2 - 4y) = 0
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