Find the Complete Solution of the System $$\left\{ \begin{array} { r } x + z = 3 \\y + 2 z = 1 \\- y + z = - 1\end{array} \right.$$

Find the complete solution of the system. $$\left\{ \begin{array} { r } x + z = 3 \\y + 2 z = 1 \\- y + z = - 1\end{array} \right.$$