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v in (-oo:+oo)
13/11 = v/4 // - v/4
13/11-(v/4) = 0
13/11-1/4*v = 0 // - 13/11
-1/4*v = -13/11 // : -1/4
v = -13/11/(-1/4)
v = 52/11
v = 52/11
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