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u in (-oo:+oo)
16*u^6-(u^2*((8*u^5)/4)) = 0
16*u^6-2*u^7 = 0
16*u^6-2*u^7 = 0
2*u^6*(8-u) = 0
8-u = 0 // - 8
-u = -8 // * -1
u = 8
2*u^6 = 0
2*u^6 = 0 // : 2
u^6 = 0
u = 0
u in { 8, 0 }
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