Use nodal analysis in the circuit of Figure P3.7 to find Va. Let R1 = 12?, R2 = 6?, R3 = 10 ?, V1 = 4V, V2 = 1V.
Known quantities:
Circuit shown in Figure P3.7 with known source voltages and resistances, 
Find:
The voltage Va.
Analysis:
Using the node voltage analysis:
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