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v in (-oo:+oo)
12 = (-4/9)*v // - (-4/9)*v
12-((-4/9)*v) = 0
(4/9)*v+12 = 0
4/9*v+12 = 0 // - 12
4/9*v = -12 // : 4/9
v = -12/4/9
v = -27
v = -27
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