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