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V in (-oo:+oo)
9 = (3/8)*V // - (3/8)*V
9-((3/8)*V) = 0
(-3/8)*V+9 = 0
9-3/8*V = 0 // - 9
-3/8*V = -9 // : -3/8
V = -9/(-3/8)
V = 24
V = 24
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