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V in (-oo:+oo)
V/5 = 6.25 // - 6.25
V/5-6.25 = 0
1/5*V-6.25 = 0 // + 6.25
1/5*V = 6.25 // : 1/5
V = 6.25/1/5
V = 31.25
V = 31.25
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