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v in (-oo:+oo)
8/3-((1/2)*v) = -1/3 // + -1/3
8/3-((1/2)*v)-(-1/3) = 0
(-1/2)*v+8/3+1/3 = 0
3-1/2*v = 0 // - 3
-1/2*v = -3 // : -1/2
v = -3/(-1/2)
v = 6
v = 6
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