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v in (-oo:+oo)
3/13 = v/8 // - v/8
3/13-(v/8) = 0
3/13-1/8*v = 0 // - 3/13
-1/8*v = -3/13 // : -1/8
v = -3/13/(-1/8)
v = 24/13
v = 24/13
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