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x in (-oo:+oo)
(2/3)*x^2-((10/3)*x) = -6 // + 6
(2/3)*x^2-((10/3)*x)+6 = 0
(2/3)*x^2+(-10/3)*x+6 = 0
2/3*x^2-10/3*x+6 = 0
DELTA = (-10/3)^2-(2/3*4*6)
DELTA = -44/9
DELTA < 0
x belongs to the empty set
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