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v in (-oo:+oo)
6/8 = v/12 // - v/12
6/8-(v/12) = 0
3/4-1/12*v = 0 // - 3/4
-1/12*v = -3/4 // : -1/12
v = -3/4/(-1/12)
v = 9
v = 9
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