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v in (-oo:+oo)
49 = (7/8)*v // - (7/8)*v
49-((7/8)*v) = 0
(-7/8)*v+49 = 0
49-7/8*v = 0 // - 49
-7/8*v = -49 // : -7/8
v = -49/(-7/8)
v = 56
v = 56
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