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D( x )
x = 0
1/x <= 0
x = 0
x = 0
1/x <= 0
1/x <= 0
1*x^-1 <= 0
1*x^-1 <= 0 // : 1
x^-1 <= 0/1
x^-1 <= 0
1/(x^1) <= 0
x <> 0
1/(x^1) <= 0 // * x^2
(x^2)/(x^1) <= 0
x^1 <= 0
x <= 0
x in (-oo:0)
x in (0:+oo)
ln(1/x) = 5 // - 5
ln(1/x)-5 = 0
ln(1/x)-5 = 0 // + 5
ln(1/x) = 5
ln(1/x) = ln(e^5)
1/x = e^5
1/x-e^5 = 0
1*x^-1 = e^5 // : 1
x^-1 = e^5
-1 < 0
1/(x^1) = e^5 // * x^1
1 = e^5*x^1 // : e^5
1/(e^5) = x^1
x = 1/(e^5)
x = 1/(e^5)
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