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v in (-oo:+oo)
12 = (-6/7)*v // - (-6/7)*v
12-((-6/7)*v) = 0
(6/7)*v+12 = 0
6/7*v+12 = 0 // - 12
6/7*v = -12 // : 6/7
v = -12/6/7
v = -14
v = -14
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