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V in (-oo:+oo)
3*V = 3/20 // - 3/20
3*V-(3/20) = 0
3*V-3/20 = 0
3*V-3/20 = 0 // + 3/20
3*V = 3/20 // : 3
V = 3/20/3
V = 1/20
V = 1/20
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