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