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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 98.78 // - 98.78
1/x-98.78 = 0
1*x^-1 = 98.78 // : 1
x^-1 = 98.78
-1 < 0
1/(x^1) = 98.78 // * x^1
1 = 98.78*x^1 // : 98.78
0.01012351 = x^1
x = 0.01012351
x = 0.01012351
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