A learner wrote in with this question as she prepared for a physics final. It’s looks complicated. But there’s a trick!

Created by Willy McAllister. (This is the very first video I made for Khan Academy.)

Open this simulation model of the original circuit. Click on DC to perform a DC analysis to find the current.

Another version of the circuit using the ‘trick’ of adding a wire between the two identical voltage nodes. To make the simulator work you have to remove one of the batteries. Notice ii has the same value as the original circuit. Notice all the current flows through the one battery.