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(x^2)/3-x-(4/27) = 0
(x^2)/3-x-4/27 = 0
1/3*x^2-x-4/27 = 0
DELTA = (-1)^2-(-4/27*1/3*4)
DELTA = 97/81
DELTA > 0
x = ((97/81)^(1/2)+1)/(1/3*2) or x = (1-(97/81)^(1/2))/(1/3*2)
x = 3/2*((97/81)^(1/2)+1) or x = 3/2*(1-(97/81)^(1/2))
x in { 3/2*(1-(97/81)^(1/2)), 3/2*((97/81)^(1/2)+1) }
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