x/x-1 + x-1/x = 2×1/2
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x/x-1 + x-1/x = 2×1/2
x²-(x-1)(x-1)/(x-1)(x) = 1
x²-(x-1)²/x²-x = 1
x²-(x²-2x+1) = x²-x
x²-x²+2x-1 = x²-x
2x-1 = x²-x
x²-3x+1 = 0
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