Find the inverse of each of the following matrices by using elementary row transformations: \[ \...

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Find the inverse of each of the following matrices by using elementary row transformations:
\[
\left[\begin{array}{lll}
2 & 3 & 1 \\
2 & 4 & 1 \\
3 & 7 & 2
\end{array}\right]
\]
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