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v in (-oo:+oo)
8/15 = (4/5)*v // - (4/5)*v
8/15-((4/5)*v) = 0
(-4/5)*v+8/15 = 0
8/15-4/5*v = 0 // - 8/15
-4/5*v = -8/15 // : -4/5
v = -8/15/(-4/5)
v = 2/3
v = 2/3
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