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(x^2)/3-((x^1)/3)-2 = 0
(x^2)/3-(x/3)-2 = 0
1/3*x^2-1/3*x-2 = 0
DELTA = (-1/3)^2-(-2*1/3*4)
DELTA = 25/9
DELTA > 0
x = ((25/9)^(1/2)+1/3)/(1/3*2) or x = (1/3-(25/9)^(1/2))/(1/3*2)
x = 3 or x = -2
x in { -2, 3 }
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