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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
5*X+3/X+6 = 0
5*X^1+3*X^-1+6*X^0 = 0
(5*X^2+6*X^1+3*X^0)/(X^1) = 0 // * X^2
X^1*(5*X^2+6*X^1+3*X^0) = 0
X^1
5*X^2+6*X+3 = 0
5*X^2+6*X+3 = 0
DELTA = 6^2-(3*4*5)
DELTA = -24
DELTA < 0
X in { }
X belongs to the empty set
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