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x^3*((6*x^5-(9*x^2))/3) = 0
x^3*((6*x^5-9*x^2)/3) = 0
(x^3*(6*x^5-9*x^2))/3 = 0
6*x^5-9*x^2 = 0
3*x^2*(2*x^3-3) = 0
2*x^3 = 3 // : 2
x^3 = 3/2
x^3 = 3/2 // ^ 1/3
x = (3/2)^(1/3)
3*x^2*(x-(3/2)^(1/3)) = 0
(3*x^2*x^3*(x-(3/2)^(1/3)))/3 = 0
( 3*x^2 )
3*x^2 = 0 // : 3
x^2 = 0
x = 0
( x-(3/2)^(1/3) )
x-(3/2)^(1/3) = 0 // + (3/2)^(1/3)
x = (3/2)^(1/3)
( x^3 )
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { 0, (3/2)^(1/3), 0 }
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