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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
38.5/x = 0.71 // - 0.71
38.5/x-0.71 = 0
38.5*x^-1 = 0.71 // : 38.5
x^-1 = 0.01844156
-1 < 0
1/(x^1) = 0.01844156 // * x^1
1 = 0.01844156*x^1 // : 0.01844156
54.22534753 = x^1
x = 54.22534753
x = 54.22534753
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