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u in (-oo:+oo)
18*u^7-(u^3*((24*u^5)/3)) = 0
18*u^7-8*u^8 = 0
18*u^7-8*u^8 = 0
2*u^7*(9-4*u) = 0
9-4*u = 0 // - 9
-4*u = -9 // : -4
u = -9/(-4)
u = 9/4
2*u^7 = 0
2*u^7 = 0 // : 2
u^7 = 0
u = 0
u in { 9/4, 0 }
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