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v in (-oo:+oo)
40 = (5/8)*v // - (5/8)*v
40-((5/8)*v) = 0
(-5/8)*v+40 = 0
40-5/8*v = 0 // - 40
-5/8*v = -40 // : -5/8
v = -40/(-5/8)
v = 64
v = 64
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