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