How to solve these kind of electric circuit?

Question

This question from Physics For Scientists And Engineers 7th page 746.

After redrawing , Actually I cant see any two clear capacitors that we can be combined , First we cant combine $C$1 with $C$2 because the point $a$, and the same argument on $C$3 with $C$4 because the point $b$, And personally I cant combine any of $C$1 ,$C$2 ,$C$3 and $C$4 with $C$3 because I don't know where should I put the equivalent capacitor.

To be more clear , How we can solve these kind of circuit ?

Answer 1

The net capacitance must be 3, You can eliminate the capacitor of 8 farad from the circuit as the design satisfies Wheatstone bridge config(can be proved with Kirchhoff law).