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x in (-oo:+oo)
x+4/3 = 3*x^2 // - 3*x^2
x-(3*x^2)+4/3 = 0
x-3*x^2+4/3 = 0
x-3*x^2+4/3 = 0
DELTA = 1^2-(-3*4/3*4)
DELTA = 17
DELTA > 0
x = (17^(1/2)-1)/(-3*2) or x = (-17^(1/2)-1)/(-3*2)
x = (17^(1/2)-1)/(-6) or x = (17^(1/2)+1)/6
x in { (17^(1/2)-1)/(-6), (17^(1/2)+1)/6 }
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