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