The gain of the system can be obtained as:
$$ \frac{V_{\mathrm{\ell}}}{V_{s}}=\frac{A_{v}\,\left(R_{a}+R_{b}\right)}{R_{a}+R_{b}+A_{v}\,R_{b}} $$
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SLiCAP: Symbolic Linear Circuit Analysis Program, Version 0.6 © 2009-2019 Anton Montagne
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