WeBWorK Standalone Renderer

Use the Gauss-Jordan reduction to solve the following linear system:

$\left\{ \begin{array}{rcrcrcr} x_1 & - & x_2 & - & 4 x_3 & = & 6 \cr 5 x_1 & - & 6 x_2 & - & 4 x_3 & = & 8 \cr -2 x_1 & & & + & 40 x_3 & = & -56 \end{array} \right.$

$\left[\begin{array}{c} x_1 \\ x_2 \\ x_3 \end{array} \right]$ $=$ $\left[\Rule{0pt}{3.6em}{0pt}\right.$ $\left]\Rule{0pt}{3.6em}{0pt}\right.$ $\ +\ s\$ $\left[\Rule{0pt}{3.6em}{0pt}\right.$ $\left]\Rule{0pt}{3.6em}{0pt}\right.$

You can earn partial credit on this problem.