Sorry about the image size, dont know how to get it smaller... Anyway,

this is kinda like a basic inverting op-amp circuit, EXCEPT about the R4 in the middle,which makes it kinda confusing for me

Now the question stats this : Find

*VO*when

*R1*= 80 kΩ;

*R2*= 50 kΩ;

*R3*= 70 kΩ;

*R4*= 30 kΩ

*and Vin*= 5 V

What I did so far is:

( (Vi-Vx)/R1 + (Vo-Vi)/R3 + Vy/R4 + (Vy-Vx)/R2 )= 0

Where Vx = node on the left and Vy = node in the middle.

Now obviously I can't solve this question with my equation, this is where you guys come in.

Thanks in advanced.