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