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v in (-oo:+oo)
12 = (-4/5)*v // - (-4/5)*v
12-((-4/5)*v) = 0
(4/5)*v+12 = 0
4/5*v+12 = 0 // - 12
4/5*v = -12 // : 4/5
v = -12/4/5
v = -15
v = -15
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