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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/5)*x+3/x = 0
2/5*x^1+3*x^-1 = 0
(2/5*x^2+3*x^0)/(x^1) = 0 // * x^2
x^1*(2/5*x^2+3*x^0) = 0
x^1
(2/5)*x^2+3 = 0
(2/5)*x^2+3 = 0
DELTA = 0^2-(3*4*(2/5))
DELTA = -24/5
DELTA < 0
x in { }
x belongs to the empty set
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