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V in (-oo:+oo)
V/5 = 7/13 // - 7/13
V/5-(7/13) = 0
V/5-7/13 = 0
1/5*V-7/13 = 0 // + 7/13
1/5*V = 7/13 // : 1/5
V = 7/13/1/5
V = 35/13
V = 35/13
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