Hi guys, I solved this problem out. I'm just curious as to see if my work is valid. I strongly believe it is, but perhaps you can help me.
I do have a quick question... once I've found all the voltages at specific nodes, I_o is the difference of the voltage / resistance between the nodes. Now, if you look at the diagram, would it be V_4 - V_3 or vice versa? I'm guessing V_3 - V_4, just to satisfy PSC. (notice, in the bottom right corner, I left the V subscripts as blank, for the time being).
Here's the work:
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