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x^2*((18*x^3-(6*x^2))/3) = 0
x^2*((18*x^3-6*x^2)/3) = 0
(x^2*(18*x^3-6*x^2))/3 = 0
18*x^3-6*x^2 = 0
6*x^2*(3*x-1) = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
6*x^2*(x-1/3) = 0
(6*x^2*x^2*(x-1/3))/3 = 0
( 6*x^2 )
6*x^2 = 0 // : 6
x^2 = 0
x = 0
( x-1/3 )
x-1/3 = 0 // + 1/3
x = 1/3
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 0, 1/3, 0 }
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