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