Can anyone help me out with this tension problem please?

The two blocks in the figure are sliding down the incline. What is the tension in the massless string?
[PLAIN]http://img842.imageshack.us/img842/2586/physicshelp.jpg [Broken]



2. Relevant equations

F=ma
That's honestly all I got.


3. The attempt at a solution

Well I realized that the higher block's friction adds to the tension, and the lower block's friction reduces tension. That being said they are equal so I disregarded them and simply tried

2gsin20-gsin20=Ft
 
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Sum the forces in X and Y direction and solve for Ft. Its easier if you project the X axis onto the inclined plane.

Lets just Isolate one of the blocks:
[PLAIN]http://img137.imageshack.us/img137/7338/blockeah.png [Broken]

Can you sum the forces on this block?
what about the other block?
 
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