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(2*x^2)/3-((5*x^1)/3)-3 = 0
(2*x^2)/3+(-5/3)*x-3 = 0
2/3*x^2-5/3*x-3 = 0
DELTA = (-5/3)^2-(-3*2/3*4)
DELTA = 97/9
DELTA > 0
x = ((97/9)^(1/2)+5/3)/(2/3*2) or x = (5/3-(97/9)^(1/2))/(2/3*2)
x = 3/4*((97/9)^(1/2)+5/3) or x = 3/4*(5/3-(97/9)^(1/2))
x in { 3/4*(5/3-(97/9)^(1/2)), 3/4*((97/9)^(1/2)+5/3) }
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