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V in (-oo:+oo)
2/8 = V/12 // - V/12
2/8-(V/12) = 0
1/4-1/12*V = 0 // - 1/4
-1/12*V = -1/4 // : -1/12
V = -1/4/(-1/12)
V = 3
V = 3
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