Im struggling with Thevenins Theorem. I've used the DC section on this website for help (http://www.allaboutcircuits.com/vol_1/chpt_10/8.html) and I understand the basics of what to for that particular circuit however I'm stumped when it comes to applying the laws to a circuit laid out differently.

My question is laid out as..

With a little assistance on how to utilise the batteries, im confident i can work out the Thev Equivalent. Im just unsure on where to start.

Thanks