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x in (-oo:+oo)
x*((3*x-2)/3)+2 = 4 // - 4
x*((3*x-2)/3)-4+2 = 0
(x*(3*x-2))/3-4+2 = 0
(x*(3*x-2))/3+(-4*3)/3+(2*3)/3 = 0
x*(3*x-2)-4*3+2*3 = 0
3*x^2-2*x-12+6 = 0
3*x^2-2*x-6 = 0
3*x^2-2*x-6 = 0
3*x^2-2*x-6 = 0
DELTA = (-2)^2-(-6*3*4)
DELTA = 76
DELTA > 0
x = (76^(1/2)+2)/(2*3) or x = (2-76^(1/2))/(2*3)
x = (2*19^(1/2)+2)/6 or x = (2-2*19^(1/2))/6
(x-((2-2*19^(1/2))/6))*(x-((2*19^(1/2)+2)/6)) = 0
((x-((2-2*19^(1/2))/6))*(x-((2*19^(1/2)+2)/6)))/3 = 0
((x-((2-2*19^(1/2))/6))*(x-((2*19^(1/2)+2)/6)))/3 = 0 // * 3
(x-((2-2*19^(1/2))/6))*(x-((2*19^(1/2)+2)/6)) = 0
( x-((2*19^(1/2)+2)/6) )
x-((2*19^(1/2)+2)/6) = 0 // + (2*19^(1/2)+2)/6
x = (2*19^(1/2)+2)/6
( x-((2-2*19^(1/2))/6) )
x-((2-2*19^(1/2))/6) = 0 // + (2-2*19^(1/2))/6
x = (2-2*19^(1/2))/6
x in { (2*19^(1/2)+2)/6, (2-2*19^(1/2))/6 }
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