Analyzing Parallel and Series Circuits to Find Wraparound Voltage

[KrNx2Oh7]

I need to find the voltage seen by the wraparound (WA) after R1, but I'm not really sure what's in parallel or series.

When I redraw the circuit I get voltage sources in parallel. So far I think r4 and r3 are in series together. r1 and r2 are parallel along with the r4 and r3 .

http://imageshack.us/photo/my-images/219/59571528.png/

http://imageshack.us/f/219/59571528.png/

 

[Bob S]

Looks like homework. Hint: redraw ckt so R2 R3 and R4 all attach to same common ground.