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v in (-oo:+oo)
7/13 = v/12 // - v/12
7/13-(v/12) = 0
7/13-1/12*v = 0 // - 7/13
-1/12*v = -7/13 // : -1/12
v = -7/13/(-1/12)
v = 84/13
v = 84/13
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