In Figure 3, consider the circuit sketched. The two batteries have negligible internal resistance and emf's ε1 = 28.0 V and ε2 = 42.0 V. The three resistors have resistance R1 = 2.00 Ω, R2 = 5.00 Ω, R3 = 1.00 Ω. Calculate the potential difference Va - Vb between points a and b.
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