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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 6/23 // - 6/23
5/x-(6/23) = 0
5/x-6/23 = 0
5*x^-1 = 6/23 // : 5
x^-1 = 6/115
-1 < 0
1/(x^1) = 6/115 // * x^1
1 = 6/115*x^1 // : 6/115
115/6 = x^1
x = 115/6
x = 115/6
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