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v in (-oo:+oo)
10/9 = 5*v // - 5*v
10/9-(5*v) = 0
10/9-5*v = 0
10/9-5*v = 0 // - 10/9
-5*v = -10/9 // : -5
v = -10/9/(-5)
v = 2/9
v = 2/9
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