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v in (-oo:+oo)
12 = (-2/7)*v // - (-2/7)*v
12-((-2/7)*v) = 0
(2/7)*v+12 = 0
2/7*v+12 = 0 // - 12
2/7*v = -12 // : 2/7
v = -12/2/7
v = -42
v = -42
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