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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 1.393 // - 1.393
1/x-1.393 = 0
1*x^-1 = 1.393 // : 1
x^-1 = 1.393
-1 < 0
1/(x^1) = 1.393 // * x^1
1 = 1.393*x^1 // : 1.393
0.71787509 = x^1
x = 0.71787509
x = 0.71787509
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