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v in (-oo:+oo)
12 = (-4/7)*v // - (-4/7)*v
12-((-4/7)*v) = 0
(4/7)*v+12 = 0
4/7*v+12 = 0 // - 12
4/7*v = -12 // : 4/7
v = -12/4/7
v = -21
v = -21
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