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