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x in (-oo:+oo)
(x^2)/3-((6*x^1)/3) = -8 // + 8
(x^2)/3-((6*x^1)/3)+8 = 0
(x^2)/3-2*x+8 = 0
1/3*x^2-2*x+8 = 0
DELTA = (-2)^2-(1/3*4*8)
DELTA = -20/3
DELTA < 0
x belongs to the empty set
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