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x in (-oo:+oo)
(x*((6*x^3)/2)-8)*(3*x-((12/9)*x^2)) = 0
(x*((6*x^3)/2)-8)*((-4/3)*x^2+3*x) = 0
(3*x^4-8)*(3*x-4/3*x^2) = 0
3*x-4/3*x^2 = 0
x*(3-4/3*x) = 0
3-4/3*x = 0 // - 3
-4/3*x = -3 // : -4/3
x = -3/(-4/3)
x = 9/4
x*(x-9/4) = 0
x*(3*x^4-8)*(x-9/4) = 0
( 3*x^4-8 )
3*x^4 = 8 // : 3
x^4 = 8/3
x^4 = 8/3 // ^ 1/4
abs(x) = (8/3)^(1/4)
x = (8/3)^(1/4) or x = -(8/3)^(1/4)
( x-9/4 )
x-9/4 = 0 // + 9/4
x = 9/4
( x )
x = 0
x in { (8/3)^(1/4), -(8/3)^(1/4), 9/4, 0 }
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