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v in (-oo:+oo)
8/11 = v/4 // - v/4
8/11-(v/4) = 0
8/11-1/4*v = 0 // - 8/11
-1/4*v = -8/11 // : -1/4
v = -8/11/(-1/4)
v = 32/11
v = 32/11
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