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v in (-oo:+oo)
11/8 = v/13 // - v/13
11/8-(v/13) = 0
11/8-1/13*v = 0 // - 11/8
-1/13*v = -11/8 // : -1/13
v = -11/8/(-1/13)
v = 143/8
v = 143/8
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