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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 58.8 // - 58.8
1/x-58.8 = 0
1*x^-1 = 58.8 // : 1
x^-1 = 58.8
-1 < 0
1/(x^1) = 58.8 // * x^1
1 = 58.8*x^1 // : 58.8
0.0170068 = x^1
x = 0.0170068
x = 0.0170068
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