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V in (-oo:+oo)
V/13 = 3/8 // - 3/8
V/13-(3/8) = 0
V/13-3/8 = 0
1/13*V-3/8 = 0 // + 3/8
1/13*V = 3/8 // : 1/13
V = 3/8/1/13
V = 39/8
V = 39/8
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