17.  Using elementary row transformations, find the inverse of the following matrix:

$\left[\begin{array}{ccc}3& 4& 2\\ 0& 2& -3\\ 1& -2& 6\end{array}\right]$

or
$$\begin{gathered} If A=\left[\begin{array}{ccc}2& 1& 3\\ 4& -1& 0\\ -7& 2& 1\end{array}\right], find A^{-1} and hence solve the following system of equations: \\ 2x+y+3z=3 \\ 4x-y=3 \\ -7x+2y+z=2 \end{gathered}$$