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