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v in (-oo:+oo)
11/13 = v/9 // - v/9
11/13-(v/9) = 0
11/13-1/9*v = 0 // - 11/13
-1/9*v = -11/13 // : -1/9
v = -11/13/(-1/9)
v = 99/13
v = 99/13
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