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x in (-oo:+oo)
(x^2)/3 = x/2+5/6 // - x/2+5/6
(x^2)/3-(x/2)-(5/6) = 0
(x^2)/3-(x/2)-5/6 = 0
1/3*x^2-1/2*x-5/6 = 0
DELTA = (-1/2)^2-(-5/6*1/3*4)
DELTA = 49/36
DELTA > 0
x = ((49/36)^(1/2)+1/2)/(1/3*2) or x = (1/2-(49/36)^(1/2))/(1/3*2)
x = 5/2 or x = -1
x in { -1, 5/2 }
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