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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-X = 1 // - 1
2/x-X-1 = 0
2*x^-1 = -(-X-1) // : 2
x^-1 = (X+1)/2
-1 < 0
1/(x^1) = (X+1)/2 // * x^1
1 = x^1*((X+1)/2) // : (X+1)/2
2*(X+1)^-1 = x^1
x = 2*(X+1)^-1
x = 2*(X+1)^-1
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