\begin{array}{ccc}
    \begin{array}{rrrrr}
    5 x_1 & - x_2   & + x_3   & = & 0  \\
    2 x_1 & + 8 x_2 & - x_3   & = & 11 \\
    - x_1 & + x_2   & + 4 x_3 & = & 3
    \end{array}
& \rightarrow &
    \begin{array}{rcllrrrr}
    x_1 & = & (1 / 5) & (  0 & & + x_2 & - x_3 ) \\
    x_2 & = & (1 / 8) & ( 11 & - 2 x_1 & & + x_3 ) \\
    x_3 & = & (1 / 4) & (  3 & + x_1 & - x_2 & )
    \end{array}
\end{array}