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u in (-oo:+oo)
16*u^6-(u^3*((10*u^4)/2)) = 0
16*u^6-5*u^7 = 0
16*u^6-5*u^7 = 0
u^6*(16-5*u) = 0
16-5*u = 0 // - 16
-5*u = -16 // : -5
u = -16/(-5)
u = 16/5
u^6 = 0
1*u^6 = 0 // : 1
u^6 = 0
u = 0
u in { 16/5, 0 }
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