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