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v in (-oo:+oo)
24 = (-4/7)*v // - (-4/7)*v
24-((-4/7)*v) = 0
(4/7)*v+24 = 0
4/7*v+24 = 0 // - 24
4/7*v = -24 // : 4/7
v = -24/4/7
v = -42
v = -42
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