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## Homework Statement

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Find the potential difference between points b and a in the circuit below

I have already solved for the voltages of the two batteries (1 and 2) in the circuit (18 V and 7 V respectively)

2. Homework Equations

2. Homework Equations

Kirchhoff's Rules

1) Potential difference across any closed loop is 0

2) Current in = current out

## The Attempt at a Solution

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I have read that Kirchhoff's current rule is how to approach these kinds of problems, but I am not sure how.