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x*((3*x^3-(18*x^2)-(9*x))/3) = 0
x*((3*x^3-18*x^2-9*x)/3) = 0
(x*(3*x^3-18*x^2-9*x))/3 = 0
3*x^3-18*x^2-9*x = 0
3*x*(x^2-6*x-3) = 0
x^2-6*x-3 = 0
DELTA = (-6)^2-(-3*1*4)
DELTA = 48
DELTA > 0
x = (48^(1/2)+6)/(1*2) or x = (6-48^(1/2))/(1*2)
x = (4*3^(1/2)+6)/2 or x = (6-4*3^(1/2))/2
3*x*(x-((6-4*3^(1/2))/2))*(x-((4*3^(1/2)+6)/2)) = 0
(3*x*x*(x-((6-4*3^(1/2))/2))*(x-((4*3^(1/2)+6)/2)))/3 = 0
( 3*x )
3*x = 0 // : 3
x = 0
( x-((4*3^(1/2)+6)/2) )
x-((4*3^(1/2)+6)/2) = 0 // + (4*3^(1/2)+6)/2
x = (4*3^(1/2)+6)/2
( x-((6-4*3^(1/2))/2) )
x-((6-4*3^(1/2))/2) = 0 // + (6-4*3^(1/2))/2
x = (6-4*3^(1/2))/2
( x )
x = 0
x in { 0, (4*3^(1/2)+6)/2, (6-4*3^(1/2))/2, 0 }
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