1. The problem statement, all variables and given/known data http://img507.imageshack.us/img507/6493/f7868b61c6cb4d6084fa5ba.png [Broken] 2. Relevant equations 3. The attempt at a solution I've tried to deduct how my textbook has actually done this Thevenin Equivalent. No one in my class (that I've come into contact with anyway) actually has a clue about this, and we don't have lectures/tutorials for 3 weeks. This isn't a homework question, but is a smaller part to another question we are expected to do. This was taken from a textbook. So if possible, my classmates and I would really appreciate it if you could explain the process in how they've transformed that first part of the circuit. Thanks!