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## Homework Statement

I am attempting to solve problem number 4 from the following picture:

http://img641.imageshack.us/img641/7950/imageisx.jpg [Broken]

In the picture you can see the suggested line of "cut" for the first application of Thevenin's theorem.

## The Attempt at a Solution

I have tried to find the Thevenin equivalent voltage (for the part on the left from the sketched line). I get:

[tex]V_{oc} = 12 \angle 0 - 2 * 6 \angle 0 = 0[/tex]

which would render the whole exercise surprisingly trivial.

What the heck is wrong with the above equation? I would be grateful for any help on this one.

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