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X in (-oo:+oo)
X*((3*X-2)/2)-3 = 6 // - 6
X*((3*X-2)/2)-6-3 = 0
(X*(3*X-2))/2-6-3 = 0
(X*(3*X-2))/2+(-6*2)/2+(-3*2)/2 = 0
X*(3*X-2)-6*2-3*2 = 0
3*X^2-2*X-12-6 = 0
3*X^2-2*X-18 = 0
3*X^2-2*X-18 = 0
3*X^2-2*X-18 = 0
DELTA = (-2)^2-(-18*3*4)
DELTA = 220
DELTA > 0
X = (220^(1/2)+2)/(2*3) or X = (2-220^(1/2))/(2*3)
X = (2*55^(1/2)+2)/6 or X = (2-2*55^(1/2))/6
(X-((2-2*55^(1/2))/6))*(X-((2*55^(1/2)+2)/6)) = 0
((X-((2-2*55^(1/2))/6))*(X-((2*55^(1/2)+2)/6)))/2 = 0
((X-((2-2*55^(1/2))/6))*(X-((2*55^(1/2)+2)/6)))/2 = 0 // * 2
(X-((2-2*55^(1/2))/6))*(X-((2*55^(1/2)+2)/6)) = 0
( X-((2*55^(1/2)+2)/6) )
X-((2*55^(1/2)+2)/6) = 0 // + (2*55^(1/2)+2)/6
X = (2*55^(1/2)+2)/6
( X-((2-2*55^(1/2))/6) )
X-((2-2*55^(1/2))/6) = 0 // + (2-2*55^(1/2))/6
X = (2-2*55^(1/2))/6
X in { (2*55^(1/2)+2)/6, (2-2*55^(1/2))/6 }
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