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My task is to calculate gain A=Vo/Vin for circuit on scheme (OPAMPS are ideal):

Since OPAMPS are ideal, input currents are zero and V1=V2=Vin, V11=V22=0:

KCL for node 0 suggests us that current through R4 (I4) must be zero:

On the other hand, we can calculate I4 as:

I tested circuit using Multisim and I got this:

For any input voltage Vin we have on output Vo=-Vin