Consider the following OP amp circuit in . Obtain the gain vo/vi of the amplifier.

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What I can see is I can find the voltage on positive and negative pin of top OP amp, which is 30/50*vi (because positive pin of top OP amp is in parallel with 30 ohm resistor, in other words, they have same voltage and inverting and non-inverting pins of OP amplifier have same voltage.

Next, I can find the voltage of bottom OP amp, the same way, 80/120*vi or 20/30*vi.

After this I'm stuck ,as I don't know what to do. Two of the OP amps are connected together, but have different voltages. Is that mean that excess voltage (ie 20/30*vi - 30/50*vi) is at the 2k ohm resistor? I see that I require to use KVL in order to solve it, I just don't know from where to start