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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 0.702 // - 0.702
1/x-0.702 = 0
1*x^-1 = 0.702 // : 1
x^-1 = 0.702
-1 < 0
1/(x^1) = 0.702 // * x^1
1 = 0.702*x^1 // : 0.702
1.42450142 = x^1
x = 1.42450142
x = 1.42450142
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