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