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u in (-oo:+oo)
4*u^7-(u^3*((12*u^5)/2)) = 0
4*u^7-6*u^8 = 0
4*u^7-6*u^8 = 0
2*u^7*(2-3*u) = 0
2-3*u = 0 // - 2
-3*u = -2 // : -3
u = -2/(-3)
u = 2/3
2*u^7 = 0
2*u^7 = 0 // : 2
u^7 = 0
u = 0
u in { 2/3, 0 }
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