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