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