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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.2/x = 4117/10 // - 4117/10
3.2/x-(4117/10) = 0
3.2/x-4117/10 = 0
3.2*x^-1 = 4117/10 // : 3.2
x^-1 = 128.65625
-1 < 0
1/(x^1) = 128.65625 // * x^1
1 = 128.65625*x^1 // : 128.65625
0.00777265 = x^1
x = 0.00777265
x = 0.00777265
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