Find v_{o} across an 8 Ω resistor that joins a top node to the bottom wire (top positive). Left branch: a 3 A current source (arrow downward) in parallel with 4 Ω, followed by a 2 Ω resistor in series to the top node. Right branch: a 12 V source (+ at top) behind 3 Ω, connected to the top node. Use source transformation. (answer in V)