# Finding the Reduced Row Echelon Form of a Matrix

$A = \left[ \begin{array}{ccc} 1 & 4 & -5 \\ 6 & 4 & 0 \\ 2 & 2 & -1 \\ \end{array} \right]$

What is the sum of all the entries in $\text{rref}(A)?$

Note: $\text{rref}(A)$ stands for the "reduced row echelon form" of matrix $A.$

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