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v in (-oo:+oo)
16/7 = -8*v // + -8*v
16/7-(-8*v) = 0
8*v+16/7 = 0
8*v+16/7 = 0 // - 16/7
8*v = -16/7 // : 8
v = -16/7/8
v = -2/7
v = -2/7
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