Analysis with Opamps: Find Gain & Solve for Unknowns

[Cocoleia]

Homework Statement

I need to find the gain.

Homework Equations

The Attempt at a Solution

I know gain will be Vo/Vs. I originally tried to write different equations for each node, but I ended up with 5 eqns and 5 unknowns, and in the end it gave that vs=0V. Can someone give me an idea of what the first step(s) would be? Thanks.

 

[NascentOxygen]

This thread will be deleted shortly, because you have shown insufficient working to demonstrate your reasonable attempt.

However, I'll make the observation that something is amiss. If we assume the OP-AMP to be ideal, with gain approaching infinity, then with its input connected to an ideal voltage source as shown here, we have Vout = ∞.

You need to check that you have correctly copied the circuit and connections at each of the OP-AMP's inputs.