Enter values for the matrix.
Enter fractions with a slash, as "3/4" or "-10/3".

Reduce the column containing the red cell.

\(\left[\begin{array}{rrr|r}\large\color{Red} {-3} & 3 & 3 & -18 \\ 2 & 5 & -1 & 0 \\ 5 & 1 & 1 & -6\end{array}\right]\begin{array}{ll}\large\phantom{1} & \\ \phantom{1} & \\ \phantom{1} & \end{array}\)