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v in (-oo:+oo)
52 = (4/8)*v // - (4/8)*v
52-((4/8)*v) = 0
(-1/2)*v+52 = 0
52-1/2*v = 0 // - 52
-1/2*v = -52 // : -1/2
v = -52/(-1/2)
v = 104
v = 104
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