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x in (-oo:+oo)
(5*x^2)/3 = x-(1/3) // - x-(1/3)
(5*x^2)/3-x+1/3 = 0
5/3*x^2-x+1/3 = 0
DELTA = (-1)^2-(1/3*5/3*4)
DELTA = -11/9
DELTA < 0
x belongs to the empty set
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