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