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v in (-oo:+oo)
16 = (-4/5)*v // - (-4/5)*v
16-((-4/5)*v) = 0
(4/5)*v+16 = 0
4/5*v+16 = 0 // - 16
4/5*v = -16 // : 4/5
v = -16/4/5
v = -20
v = -20
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