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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3 = 1/4-(5/x) // - 1/4-(5/x)
5/x-(1/4)+3 = 0
5/x-1/4+3 = 0
5*x^-1 = -11/4 // : 5
x^-1 = -11/20
-1 < 0
1/(x^1) = -11/20 // * x^1
1 = -11/20*x^1 // : -11/20
-20/11 = x^1
x = -20/11
x = -20/11
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