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x^2-((1/3)*x)-(1/6) = 0
x^2+(-1/3)*x-1/6 = 0
x^2-1/3*x-1/6 = 0
DELTA = (-1/3)^2-(-1/6*1*4)
DELTA = 7/9
DELTA > 0
x = ((7/9)^(1/2)+1/3)/(1*2) or x = (1/3-(7/9)^(1/2))/(1*2)
x = ((7/9)^(1/2)+1/3)/2 or x = (1/3-(7/9)^(1/2))/2
x in { (1/3-(7/9)^(1/2))/2, ((7/9)^(1/2)+1/3)/2 }
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