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x in (-oo:+oo)
(x^3)/6-(8*x) = (x^2)/3 // - (x^2)/3
(x^3)/6-((x^2)/3)-(8*x) = 0
(x^3)/6-((x^2)/3)-8*x = 0
1/6*x^3-1/3*x^2-8*x = 0
x*(1/6*x^2-1/3*x-8) = 0
1/6*x^2-1/3*x-8 = 0
DELTA = (-1/3)^2-(-8*1/6*4)
DELTA = 49/9
DELTA > 0
x = ((49/9)^(1/2)+1/3)/(1/6*2) or x = (1/3-(49/9)^(1/2))/(1/6*2)
x = 8 or x = -6
x = 0
x = 0
x in { -6, 8, 0 }
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