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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/2)*x+8/x = 0
5/2*x^1+8*x^-1 = 0
(5/2*x^2+8*x^0)/(x^1) = 0 // * x^2
x^1*(5/2*x^2+8*x^0) = 0
x^1
(5/2)*x^2+8 = 0
(5/2)*x^2+8 = 0
DELTA = 0^2-(4*8*(5/2))
DELTA = -80
DELTA < 0
x in { }
x belongs to the empty set
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