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v in (-oo:+oo)
3/7 = v/6 // - v/6
3/7-(v/6) = 0
3/7-1/6*v = 0 // - 3/7
-1/6*v = -3/7 // : -1/6
v = -3/7/(-1/6)
v = 18/7
v = 18/7
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