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$[\begin{array}{c} 3 & - 2 & 9 \\ 8 & - 7 & 9 \end{array}]$

Bước 1

Transpose the matrix by switching its rows to columns.

$[\begin{array}{c} 3 & 8 \\ - 2 & - 7 \\ 9 & 9 \end{array}]$