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D( x )
x = 0
4/x <= 0
x = 0
x = 0
4/x <= 0
4/x <= 0
4*x^-1 <= 0
4*x^-1 <= 0 // : 4
x^-1 <= 0/4
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)
5.8 = ln(4/x) // - ln(4/x)
5.8-ln(4/x) = 0
5.8-ln(4/x) = 0 // - 5.8
-ln(4/x) = -5.8
-ln(4/x) = -5.8 // * -1
ln(4/x) = ln(e^5.8)
4/x = e^5.8
4/x-e^5.8 = 0
4*x^-1 = e^5.8 // : 4
x^-1 = (e^5.8)/4
-1 < 0
1/(x^1) = (e^5.8)/4 // * x^1
1 = ((e^5.8)/4)*x^1 // : (e^5.8)/4
4*e^-5.8 = x^1
x = 4*e^-5.8
x = 4*e^-5.8
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