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