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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/6)*x+9/x-3 = 0
2/3*x^1+9*x^-1-3*x^0 = 0
(2/3*x^2-3*x^1+9*x^0)/(x^1) = 0 // * x^2
x^1*(2/3*x^2-3*x^1+9*x^0) = 0
x^1
(2/3)*x^2-3*x+9 = 0
(2/3)*x^2-3*x+9 = 0
DELTA = (-3)^2-(4*9*(2/3))
DELTA = -15
DELTA < 0
x in { }
x belongs to the empty set
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