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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
1/X-(1/9) = 4/9-((2/3)*X) // - 4/9-((2/3)*X)
(2/3)*X+1/X-(1/9)-(4/9) = 0
(2/3)*X+1/X-1/9-4/9 = 0
2/3*X^1+1*X^-1-5/9*X^0 = 0
(2/3*X^2-5/9*X^1+1*X^0)/(X^1) = 0 // * X^2
X^1*(2/3*X^2-5/9*X^1+1*X^0) = 0
X^1
(2/3)*X^2+(-5/9)*X+1 = 0
(2/3)*X^2+(-5/9)*X+1 = 0
DELTA = (-5/9)^2-(1*4*(2/3))
DELTA = -191/81
DELTA < 0
X in { }
X belongs to the empty set
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