Finding the Reduced Row Echelon Form of a Matrix

Algebra Level 4

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

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

Note: \(\text{rref}(A) \) stands for the Reduced Row Echelon Form of matrix \(A\).

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