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X in (-oo:+oo)
(X^2)/3+(2*X^1)/3+1 = 0
(X^2)/3+(2*X)/3+1 = 0
1/3*X^2+2/3*X+1 = 0
DELTA = (2/3)^2-(1/3*1*4)
DELTA = -8/9
DELTA < 0
X belongs to the empty set
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