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Homework Statement
Calculate the resistance of R3 so that Vab = Va - Vb = 0, assume Rth is 75Ω.
Here is a picture of the circuit: http://i.imgur.com/zsQBYJx.jpg
Homework Equations
The Attempt at a Solution
Never seen this circuit before, don't know where to begin. I assume I have to analyze the voltage at each node and set up a system of equations which can allow me to calculate R3 based off of the values that I already know, but I'm not sure how to begin. Thanks in advance for any hints.