Solve the system $$\left\lbrace \begin{array}{r@{}r@{}r@{}r@{}r@{}r@{}r@{}r} x_1 & + 2 x_2 & - 2 x_3 & & + 5 x_5 & - 4 x_6 & = & 2 \\ & & & - x_4 & + 3 x_5 & + 3 x_6 & = & 5 \\ x_1 & + 2 x_2 & & & - 9 x_5 & - 8 x_6 & = & 2 \end{array} \right.$$
$\displaystyle \left\lbrack \begin{array}{c} x_1 \\ x_2 \\ x_3 \\ x_4 \\ x_5 \\ x_6 \end{array} \right\rbrack =$ $\left[\Rule{0pt}{7.2em}{0pt}\right.$$\left]\Rule{0pt}{7.2em}{0pt}\right.$ $+ s$ $\left[\Rule{0pt}{7.2em}{0pt}\right.$$\left]\Rule{0pt}{7.2em}{0pt}\right.$ $+ t$ $\left[\Rule{0pt}{7.2em}{0pt}\right.$$\left]\Rule{0pt}{7.2em}{0pt}\right.$ $+ u$ $\left[\Rule{0pt}{7.2em}{0pt}\right.$$\left]\Rule{0pt}{7.2em}{0pt}\right.$.