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V in (-oo:+oo)
V = (3.14*30*10^2)/3 // - (3.14*30*10^2)/3
V-((3.14*30*10^2)/3) = 0
V-31.4*10^2 = 0
V-3140 = 0 // + 3140
V = 3140
V = 3140
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