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v in (-oo:+oo)
56/12 = v/3 // - v/3
56/12-(v/3) = 0
14/3-1/3*v = 0 // - 14/3
-1/3*v = -14/3 // : -1/3
v = -14/3/(-1/3)
v = 14
v = 14
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