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v in (-oo:+oo)
8 = (-4/5)*v // - (-4/5)*v
8-((-4/5)*v) = 0
(4/5)*v+8 = 0
4/5*v+8 = 0 // - 8
4/5*v = -8 // : 4/5
v = -8/4/5
v = -10
v = -10
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