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Apparently the professor did a bad job in conveying the purpose of the analysis. But I absolutely disagree about "inefficient and outdated". Unfortunately many analog designers never learned to analyze feedback topologies...For more info on this horribly inefficient and outdated method of analysis, see
There are different ways to assign the signs in the scheme. I personally prefer positive A and B factors, having the negative feedback sign located in the substractor only. Regarding C sign, it's an inverting amplifier circuit, I think it makes more sense to switch C sign than both A and B. But I won't insist on my version.Here it is. Negative feedback looks fancier than your negative feed-forward ("C").