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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
38.5/x = 3/5 // - 3/5
38.5/x-(3/5) = 0
38.5/x-3/5 = 0
38.5*x^-1 = 3/5 // : 38.5
x^-1 = 0.01558442
-1 < 0
1/(x^1) = 0.01558442 // * x^1
1 = 0.01558442*x^1 // : 0.01558442
64.16664849 = x^1
x = 64.16664849
x = 64.16664849
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