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

Find Vo

http://img148.imageshack.us/img148/885/opamp.gif [Broken]

2. Relevant equations

Not known

3. The attempt at a solution

I understand how to find Vo. What I don't understand is where that 6/7 came from (boxed in blue).

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# Op-Amp Circuit

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