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v in (-oo:+oo)
16/9 = 8*v // - 8*v
16/9-(8*v) = 0
16/9-8*v = 0
16/9-8*v = 0 // - 16/9
-8*v = -16/9 // : -8
v = -16/9/(-8)
v = 2/9
v = 2/9
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