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