Simple op amp circuit need solving

[ZeTeX]

I need to find the equation for Vo2.
The answer is Vo2: -4*V1+2.666*V2
For Vo1 its easy it is just -3*V1, but for Vo2 there are 2 resistors going to the non inverting input and it is confusing, I'm not exactly sure how to solve such thing.

[Kire Pûdsje]

Just think of it being a voltage divider.

[ZeTeX]

Just think of it being a voltage divider.

and then what?

[Kire Pûdsje]

use superposition:
for v1: -3x amp in series with voltage divider in series with 4x amp
for v2: voltage divider (reversed ratio) in series with 4x amp

Edit:
It will be clearer if you forget about the last opamp. this is just a x4 amplifier.
You already figured out vo1, and v2 is a given. Therefore what will be the voltage at the positive input?

[ZeTeX]

use superposition:
for v1: -3x amp in series with voltage divider in series with 4x amp
for v2: voltage divider (reversed ratio) in series with 4x amp

Thank you very much!

that's exactly what I did what but I tough it it was coincidence that I got the answer right.

Basically I grounded Vo1 and V2 and calculated the ration, then I wrote the eq. Vo2 = gain (Av = 4 ) * ratio
I got 2 equations that I just summed them up.
Thanks!

[w2aew]

I have two videos that may help you.  The first helps you to intuitively understand most op amp circuits, and the second is a tutorial on the "summing amp" configuration (which is what your second stage is):

Basics of Op Amp circuits:


Tutorial on the Summing Amp: