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u in (-oo:+oo)
14*u^7-(u^3*((10*u^5)/2)) = 0
14*u^7-5*u^8 = 0
14*u^7-5*u^8 = 0
u^7*(14-5*u) = 0
14-5*u = 0 // - 14
-5*u = -14 // : -5
u = -14/(-5)
u = 14/5
u^7 = 0
1*u^7 = 0 // : 1
u^7 = 0
u = 0
u in { 14/5, 0 }
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