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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.42 = 25/x // - 25/x
0.42-(25/x) = 0
0.42-25*x^-1 = 0
-25*x^-1 = -0.42 // : -25
x^-1 = 0.0168
-1 < 0
1/(x^1) = 0.0168 // * x^1
1 = 0.0168*x^1 // : 0.0168
59.52380952 = x^1
x = 59.52380952
x = 59.52380952
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