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