try to solve this problem
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(x-1/x)^2 = x^2 + 1/x^2 - 2×x×1/x
(x-1/x)^2 = 18 - 2
x-1/x = √16
x-1/x = 4
(x-1/x)^2 = 18 - 2
x-1/x = √16
x-1/x = 4
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