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v in (-oo:+oo)
16/5 = -8*v // + -8*v
16/5-(-8*v) = 0
8*v+16/5 = 0
8*v+16/5 = 0 // - 16/5
8*v = -16/5 // : 8
v = -16/5/8
v = -2/5
v = -2/5
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