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x in (-oo:+oo)
x*((6*x-20)/3)-9 = 0
(x*(6*x-20))/3-9 = 0
(x*(6*x-20))/3+(-9*3)/3 = 0
x*(6*x-20)-9*3 = 0
6*x^2-20*x-27 = 0
6*x^2-20*x-27 = 0
6*x^2-20*x-27 = 0
DELTA = (-20)^2-(-27*4*6)
DELTA = 1048
DELTA > 0
x = (1048^(1/2)+20)/(2*6) or x = (20-1048^(1/2))/(2*6)
x = (2*262^(1/2)+20)/12 or x = (20-2*262^(1/2))/12
(x-((20-2*262^(1/2))/12))*(x-((2*262^(1/2)+20)/12)) = 0
((x-((20-2*262^(1/2))/12))*(x-((2*262^(1/2)+20)/12)))/3 = 0
((x-((20-2*262^(1/2))/12))*(x-((2*262^(1/2)+20)/12)))/3 = 0 // * 3
(x-((20-2*262^(1/2))/12))*(x-((2*262^(1/2)+20)/12)) = 0
( x-((2*262^(1/2)+20)/12) )
x-((2*262^(1/2)+20)/12) = 0 // + (2*262^(1/2)+20)/12
x = (2*262^(1/2)+20)/12
( x-((20-2*262^(1/2))/12) )
x-((20-2*262^(1/2))/12) = 0 // + (20-2*262^(1/2))/12
x = (20-2*262^(1/2))/12
x in { (2*262^(1/2)+20)/12, (20-2*262^(1/2))/12 }
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