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(1/6)*x^2+(1/2)*x-(2/3) = 0
(1/6)*x^2+(1/2)*x-2/3 = 0
1/6*x^2+1/2*x-2/3 = 0
DELTA = (1/2)^2-(-2/3*1/6*4)
DELTA = 25/36
DELTA > 0
x = ((25/36)^(1/2)-1/2)/(1/6*2) or x = (-(25/36)^(1/2)-1/2)/(1/6*2)
x = 1 or x = -4
x in { -4, 1 }
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