(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I've tried and tried and can't solve this to look like this equation. Please Help!

http://i233.photobucket.com/albums/ee237/biggyjoe210/IMAG0175.jpg

1. Show that the Acceleration of Mass A is given by : (look at picture)

2. Relevant equations

F = ma

3. The attempt at a solution

So far all I have is a = g(mA-mB)/(mA+mB)

Im lost

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# Double Atwood Machine Question

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