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

I have this circuit:

http://img59.imageshack.us/i/doublebattery.png/

2. Relevant equations

what are the currents I1, I2, and I3

and the power being delivered on each resistor

3. The attempt at a solution

i've tried doing 3 equations using the kirchhoff rules but i end up with the wrong answer...my equations were

21 - I1R1 - I3R = 0

15 - I2R2 - I3R = 0

I3 = I1 + I2

what am i doing wrong?

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# Double battery circuit

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