solve [ (x-y)^2 + (x^2/2 + y^2/2 - 1)^2 = (x^2/2 + y^2/2)^2 , (x-y)^2 + (x^2/2 + y^2/2 - 1/2)^2 = (-x^2/2 + y^2/2 + 1/2)^2 ]

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