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The $z$-parameter matrix  for the two-port network shown is $$\begin{bmatrix} 2j\omega &j\omega \\ j\omega & 3+2j\omega \end{bmatrix},$$ where the entries are in $\Omega$. Suppose $Z_{b}\left ( j\omega \right )=R_{b}+j\omega .$

                                   

 Then the value of $R_{b}$ (in $\Omega$) equals ________

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