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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 0.39 // - 0.39
5/x-0.39 = 0
5*x^-1 = 0.39 // : 5
x^-1 = 0.078
-1 < 0
1/(x^1) = 0.078 // * x^1
1 = 0.078*x^1 // : 0.078
12.82051282 = x^1
x = 12.82051282
x = 12.82051282
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