If 2x + y = 0, then the value of (x2 + XY + Y2) / (2xy-x2)

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20. Let the function defined on R satisfy f (f (x) - x2 + x) = f (x) - x2 + X, and have and only have one x0, such that f (x0) = x0, and find the analytic expression of F (x)