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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 8.2 // - 8.2
1/x-8.2 = 0
1*x^-1 = 8.2 // : 1
x^-1 = 8.2
-1 < 0
1/(x^1) = 8.2 // * x^1
1 = 8.2*x^1 // : 8.2
0.12195122 = x^1
x = 0.12195122
x = 0.12195122
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