Determine potential difference (circuits)

1. The problem statement, all variables and given/known data

Va – Vb

2. Relevant equations

V = IR
Loop rule
Node rule

3. The attempt at a solution

I’m able to find each I value, as well as the direction of current. I’m not sure what to do after that. I know the answer should be 45V, but everything I’ve tried doesn’t lead to that.

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