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