How Do You Approach Source Transformation in This Circuit?

[Mutantx]

Homework Statement

[PLAIN]http://img706.imageshack.us/img706/5328/prob31.jpg

Homework Equations

v = r * i

The Attempt at a Solution

Having issues with the left box I think. I have been starting on the right side and working left by first starting with the 5A current source. I guess I'm having issues with the circuit placement after the transformation and how it ends up turning out once you get to the left box which I believe isn't in series at all.

 

[stevenb]

Homework Statement

[PLAIN]http://img706.imageshack.us/img706/5328/prob31.jpg

Homework Equations

v = r * i

The Attempt at a Solution

Having issues with the left box I think. I have been starting on the right side and working left by first starting with the 5A current source. I guess I'm having issues with the circuit placement after the transformation and how it ends up turning out once you get to the left box which I believe isn't in series at all.

It's actually more straightforward to start from the left. The left most source (+9V with two 4 ohm resistors) can be eliminated because the -9V voltage source will force the node to a fixed voltage no matter what the +9V source current is.