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D( x )
3/x <= 0
x = 0
3/x <= 0
3/x <= 0
3*x^-1 <= 0
3*x^-1 <= 0 // : 3
x^-1 <= 0/3
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 = 0
x = 0
x in (0:+oo)
0.15 = ln(3/x) // - ln(3/x)
0.15-ln(3/x) = 0
0.15-ln(3/x) = 0 // - 0.15
-ln(3/x) = -0.15
-ln(3/x) = -0.15 // * -1
ln(3/x) = ln(e^0.15)
3/x = e^0.15
3/x-e^0.15 = 0
3*x^-1 = e^0.15 // : 3
x^-1 = (e^0.15)/3
-1 < 0
1/(x^1) = (e^0.15)/3 // * x^1
1 = ((e^0.15)/3)*x^1 // : (e^0.15)/3
3*e^-0.15 = x^1
x = 3*e^-0.15
x = 3*e^-0.15
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