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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x/25-(1/x))/1+5/x = 0
x/25-x^-1+5/x = 0
1/25*x^1+4*x^-1 = 0
(1/25*x^2+4*x^0)/(x^1) = 0 // * x^2
x^1*(1/25*x^2+4*x^0) = 0
x^1
(1/25)*x^2+4 = 0
(1/25)*x^2+4 = 0
DELTA = 0^2-(4*4*(1/25))
DELTA = -16/25
DELTA < 0
x in { }
x belongs to the empty set
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