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v in (-oo:+oo)
16/5 = 8*v // - 8*v
16/5-(8*v) = 0
16/5-8*v = 0
16/5-8*v = 0 // - 16/5
-8*v = -16/5 // : -8
v = -16/5/(-8)
v = 2/5
v = 2/5
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