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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
130/x = 3.8 // - 3.8
130/x-3.8 = 0
130*x^-1 = 3.8 // : 130
x^-1 = 0.02923077
-1 < 0
1/(x^1) = 0.02923077 // * x^1
1 = 0.02923077*x^1 // : 0.02923077
34.21052542 = x^1
x = 34.21052542
x = 34.21052542
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