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v in (-oo:+oo)
20 = (-5/8)*v // - (-5/8)*v
20-((-5/8)*v) = 0
(5/8)*v+20 = 0
5/8*v+20 = 0 // - 20
5/8*v = -20 // : 5/8
v = -20/5/8
v = -32
v = -32
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