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u in (-oo:+oo)
8*u^7-(u^3*((16*u^5)/4)) = 0
8*u^7-4*u^8 = 0
8*u^7-4*u^8 = 0
4*u^7*(2-u) = 0
2-u = 0 // - 2
-u = -2 // * -1
u = 2
4*u^7 = 0
4*u^7 = 0 // : 4
u^7 = 0
u = 0
u in { 2, 0 }
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