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V in (-oo:+oo)
12/5 = 4*V // - 4*V
12/5-(4*V) = 0
12/5-4*V = 0
12/5-4*V = 0 // - 12/5
-4*V = -12/5 // : -4
V = -12/5/(-4)
V = 3/5
V = 3/5
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