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V in (-oo:+oo)
6 = 8*(V-(3/4))-20 // - 8*(V-(3/4))-20
6-(8*(V-(3/4)))+20 = 0
6-8*(V-3/4)+20 = 0
6-8*(V-3/4)+20 = 0
12-8*V+20 = 0
32-8*V = 0
32-8*V = 0
32-8*V = 0 // - 32
-8*V = -32 // : -8
V = -32/(-8)
V = 4
V = 4
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