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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.525/x = 0.25 // - 0.25
0.525/x-0.25 = 0
0.525*x^-1 = 0.25 // : 0.525
x^-1 = 0.47619048
-1 < 0
1/(x^1) = 0.47619048 // * x^1
1 = 0.47619048*x^1 // : 0.47619048
2.09999998 = x^1
x = 2.09999998
x = 2.09999998
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