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Starting nodal analysis

The questions below are due on Wednesday September 11, 2019; 11:59:00 PM.
 
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1) Nodal Analysis

Use the node method to find the node voltage e in the figure below:

For the question below, enter the expression in terms of R_1, R_2, R_3, and the 9 V and 12 V sources. Enter R_1 as R1, etc.

Enter a symbolic expression for the voltage at node e [in V] in terms of the given values. e=