Find the inverse of each of the following matrices by using element...

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Find the inverse of each of the following matrices by using elementary row transformations:
\[
\left[\begin{array}{lll}
1 & 1 & 2 \\
3 & 1 & 1 \\
2 & 3 & 1
\end{array}\right] \text {, }
\]
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