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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.1 = 1/x // - 1/x
1.1-(1/x) = 0
1.1-x^-1 = 0
-1*x^-1 = -1.1 // : -1
x^-1 = 1.1
-1 < 0
1/(x^1) = 1.1 // * x^1
1 = 1.1*x^1 // : 1.1
0.90909091 = x^1
x = 0.90909091
x = 0.90909091
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