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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(3/x)-5 = 3/x-5 // - 3/x-5
X-(3/x)-(3/x)-5+5 = 0
X-3*x^-1-3*x^-1-5+5 = 0
-6*x^-1 = -X // : -6
x^-1 = X/6
-1 < 0
1/(x^1) = X/6 // * x^1
1 = (X/6)*x^1 // : X/6
6*X^-1 = x^1
x = 6*X^-1
x = 6*X^-1
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