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V in (-oo:+oo)
-3*V-(7/2) = (2/5)*V-(3/5) // - (2/5)*V-(3/5)
3/5-3*V-((2/5)*V)-(7/2) = 0
(-2/5)*V-3*V-7/2+3/5 = 0
-17/5*V-29/10 = 0 // + 29/10
-17/5*V = 29/10 // : -17/5
V = 29/10/(-17/5)
V = -29/34
V = -29/34
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