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(5*x^2)/3-((4*x^1)/3)-1 = 0
(5*x^2)/3+(-4/3)*x-1 = 0
5/3*x^2-4/3*x-1 = 0
DELTA = (-4/3)^2-(-1*5/3*4)
DELTA = 76/9
DELTA > 0
x = ((76/9)^(1/2)+4/3)/(5/3*2) or x = (4/3-(76/9)^(1/2))/(5/3*2)
x = 3/10*((76/9)^(1/2)+4/3) or x = 3/10*(4/3-(76/9)^(1/2))
x in { 3/10*(4/3-(76/9)^(1/2)), 3/10*((76/9)^(1/2)+4/3) }
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