Unknown Voltage Source and Current

clue: what's the voltage on the 9.1 ohm resistor? then just keep going.

 

Pantera, if you look closer https://www.physicsforums.com/showthread.php?t=159391" You might notice that I already solved a similar problem for you. I even did it in a step by step ;) So, I guess that you've to go back to the original thread and read it one more time, because the solution is there, you just can't see it. So take a better look ;)

You can either solve it by applying nodal equations as I did for you in another thread, or you can write two loop equations the describes the circuit.