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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 1.3685 // - 1.3685
1/x-1.3685 = 0
1*x^-1 = 1.3685 // : 1
x^-1 = 1.3685
-1 < 0
1/(x^1) = 1.3685 // * x^1
1 = 1.3685*x^1 // : 1.3685
0.73072707 = x^1
x = 0.73072707
x = 0.73072707
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