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D( x )
x = 0
2/x <= 0
x = 0
x = 0
2/x <= 0
2/x <= 0
2*x^-1 <= 0
2*x^-1 <= 0 // : 2
x^-1 <= 0/2
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)
0.1 = ln(2/x) // - ln(2/x)
0.1-ln(2/x) = 0
0.1-ln(2/x) = 0 // - 0.1
-ln(2/x) = -0.1
-ln(2/x) = -0.1 // * -1
ln(2/x) = ln(e^0.1)
2/x = e^0.1
2/x-e^0.1 = 0
2*x^-1 = e^0.1 // : 2
x^-1 = (e^0.1)/2
-1 < 0
1/(x^1) = (e^0.1)/2 // * x^1
1 = ((e^0.1)/2)*x^1 // : (e^0.1)/2
2*e^-0.1 = x^1
x = 2*e^-0.1
x = 2*e^-0.1
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