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(3*x^2)/3-((4*x^1)/3)-4 = 0
(3*x^2)/3+(-4/3)*x-4 = 0
x^2-4/3*x-4 = 0
DELTA = (-4/3)^2-(-4*1*4)
DELTA = 160/9
DELTA > 0
x = ((160/9)^(1/2)+4/3)/(1*2) or x = (4/3-(160/9)^(1/2))/(1*2)
x = ((160/9)^(1/2)+4/3)/2 or x = (4/3-(160/9)^(1/2))/2
x in { (4/3-(160/9)^(1/2))/2, ((160/9)^(1/2)+4/3)/2 }
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