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v in (-oo:+oo)
9/10 = (5/6)*v // - (5/6)*v
9/10-((5/6)*v) = 0
(-5/6)*v+9/10 = 0
9/10-5/6*v = 0 // - 9/10
-5/6*v = -9/10 // : -5/6
v = -9/10/(-5/6)
v = 27/25
v = 27/25
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