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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 0.83 // - 0.83
1/x-0.83 = 0
1*x^-1 = 0.83 // : 1
x^-1 = 0.83
-1 < 0
1/(x^1) = 0.83 // * x^1
1 = 0.83*x^1 // : 0.83
1.20481928 = x^1
x = 1.20481928
x = 1.20481928
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