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u in (-oo:+oo)
4*u^3-(((12*u^2)/2)*u^2) = 0
4*u^3-6*u^4 = 0
4*u^3-6*u^4 = 0
2*u^3*(2-3*u) = 0
2-3*u = 0 // - 2
-3*u = -2 // : -3
u = -2/(-3)
u = 2/3
2*u^3 = 0
2*u^3 = 0 // : 2
u^3 = 0
u = 0
u in { 2/3, 0 }
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