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v in (-oo:+oo)
8/9 = 2*v // - 2*v
8/9-(2*v) = 0
8/9-2*v = 0
8/9-2*v = 0 // - 8/9
-2*v = -8/9 // : -2
v = -8/9/(-2)
v = 4/9
v = 4/9
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