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u in (-oo:+oo)
12*u^3-(((16*u^2)/2)*u^2) = 0
12*u^3-8*u^4 = 0
12*u^3-8*u^4 = 0
4*u^3*(3-2*u) = 0
3-2*u = 0 // - 3
-2*u = -3 // : -2
u = -3/(-2)
u = 3/2
4*u^3 = 0
4*u^3 = 0 // : 4
u^3 = 0
u = 0
u in { 3/2, 0 }
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