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V in (-oo:+oo)
4*V-((2/8)*V) = 2/3 // - 2/3
4*V-((2/8)*V)-(2/3) = 0
4*V+(-1/4)*V-2/3 = 0
15/4*V-2/3 = 0 // + 2/3
15/4*V = 2/3 // : 15/4
V = 2/3/15/4
V = 8/45
V = 8/45
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