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u in (-oo:+oo)
18*u^6-(u^3*((8*u^4)/2)) = 0
18*u^6-4*u^7 = 0
18*u^6-4*u^7 = 0
2*u^6*(9-2*u) = 0
9-2*u = 0 // - 9
-2*u = -9 // : -2
u = -9/(-2)
u = 9/2
2*u^6 = 0
2*u^6 = 0 // : 2
u^6 = 0
u = 0
u in { 9/2, 0 }
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