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x in (-oo:+oo)
x*((6*x^2+2*x-9)/2) = 0
(x*(6*x^2+2*x-9))/2 = 0
6*x^2+2*x-9 = 0
6*x^2+2*x-9 = 0
DELTA = 2^2-(-9*4*6)
DELTA = 220
DELTA > 0
x = (220^(1/2)-2)/(2*6) or x = (-220^(1/2)-2)/(2*6)
x = (2*55^(1/2)-2)/12 or x = (-2*55^(1/2)-2)/12
(x-((-2*55^(1/2)-2)/12))*(x-((2*55^(1/2)-2)/12)) = 0
(x*(x-((-2*55^(1/2)-2)/12))*(x-((2*55^(1/2)-2)/12)))/2 = 0
( x-((-2*55^(1/2)-2)/12) )
x-((-2*55^(1/2)-2)/12) = 0 // + (-2*55^(1/2)-2)/12
x = (-2*55^(1/2)-2)/12
( x-((2*55^(1/2)-2)/12) )
x-((2*55^(1/2)-2)/12) = 0 // + (2*55^(1/2)-2)/12
x = (2*55^(1/2)-2)/12
( x )
x = 0
x in { (-2*55^(1/2)-2)/12, (2*55^(1/2)-2)/12, 0 }
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