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- \newcommand{\gjmatrixstep}[5]{%
- \[
- \begin{array}{c}
- \begin{blockarray}{#1}
- #2
- \begin{block}{#3}
- #4
- \end{block}
- \end{blockarray}\\
- #5
- \end{array}
- \rightarrow
- \]
- }
- \gjmatrixstep{cccc}{ccc|c}
- {x & y & z & \\}
- { 1 & 2 & -1 & 3\\
- 0 & -5 & 3 & -1 \\
- ? & ? & ? & ? \\}
- {R_2 + R_3 = R_3^*}
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