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3*x^2-(4*x)-(2/3) = 0
3*x^2-4*x-2/3 = 0
3*x^2-4*x-2/3 = 0
DELTA = (-4)^2-(-2/3*3*4)
DELTA = 24
DELTA > 0
x = (24^(1/2)+4)/(2*3) or x = (4-24^(1/2))/(2*3)
x = (2*6^(1/2)+4)/6 or x = (4-2*6^(1/2))/6
x in { (4-2*6^(1/2))/6, (2*6^(1/2)+4)/6 }
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