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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.55 = -1/x // + -1/x
0.55-(-1/x) = 0
x^-1+0.55 = 0
1*x^-1 = -0.55 // : 1
x^-1 = -0.55
-1 < 0
1/(x^1) = -0.55 // * x^1
1 = -0.55*x^1 // : -0.55
-1.81818182 = x^1
x = -1.81818182
x = -1.81818182
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