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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
39/x = 1.618 // - 1.618
39/x-1.618 = 0
39*x^-1 = 1.618 // : 39
x^-1 = 0.04148718
-1 < 0
1/(x^1) = 0.04148718 // * x^1
1 = 0.04148718*x^1 // : 0.04148718
24.10383159 = x^1
x = 24.10383159
x = 24.10383159
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