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v in (-oo:+oo)
8/10 = v/2 // - v/2
8/10-(v/2) = 0
4/5-1/2*v = 0 // - 4/5
-1/2*v = -4/5 // : -1/2
v = -4/5/(-1/2)
v = 8/5
v = 8/5
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