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D( x )
x = 0
0.1/x <= 0
x = 0
x = 0
0.1/x <= 0
0.1/x <= 0
0.1*x^-1 <= 0
0.1*x^-1 <= 0 // : 0.1
x^-1 <= 0/0.1
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)
-1.09375 = ln(0.1/x) // - ln(0.1/x)
-ln(0.1/x)-1.09375 = 0
-ln(0.1/x)-1.09375 = 0 // + 1.09375
-ln(0.1/x) = 1.09375
-ln(0.1/x) = 1.09375 // * -1
ln(0.1/x) = ln(e^-1.09375)
0.1/x = e^-1.09375
0.1/x-e^-1.09375 = 0
0.1*x^-1 = e^-1.09375 // : 0.1
x^-1 = 10*e^-1.09375
-1 < 0
1/(x^1) = 10*e^-1.09375 // * x^1
1 = 10*e^-1.09375*x^1 // : 10*e^-1.09375
1/(10*e^-1.09375) = x^1
x = 1/(10*e^-1.09375)
x = 1/(10*e^-1.09375)
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