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v in (-oo:+oo)
13/7 = v/6 // - v/6
13/7-(v/6) = 0
13/7-1/6*v = 0 // - 13/7
-1/6*v = -13/7 // : -1/6
v = -13/7/(-1/6)
v = 78/7
v = 78/7
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