How Do You Calculate Equivalent Capacitance with a Middle Capacitor?

[bassplayer142]

Homework Statement

find the equvialent capacitace

Homework Equations

ceq=c1+c2
1/ceq=1/c1+1/c2

The Attempt at a Solution

I know how to do some of these problems but this one has me stumped. I don't know how to start since the middle capacitor screws everything up. I think my teacher did it but I wasn't there for it and he won't do it again. Any help would be appreciated greatly. Don't worry about the charges and other specs as I can deal with that easily. Just the problem of the middle capacitor. I don't even know where to start to attempt this.

 

[mjsd]

go and look at the theory for bridge (wheatstone bridge) circuit setup to get some ideas.