2000019205

Let $[x,y,z]$ be the solution of the system of $3$ equations with $3$ unknowns represented by the matrix $$\left(\begin{array}{cccc}1& 2& 1& 6\\ 2& -1& 1& 1\\ -1& 1& 1& 2\end{array}\right).$$ Which of the components $x$, $y$, and $z$ is of the highest value?