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9. (5 pts) Reduce the following matrix to reduced row echelon form: 0 -2 0 7 12 4 -10 6 12 28 NN 4 -5

9. (5 pts) Reduce the following matrix to reduced row echelon form: 0 -2 0 7 12 4 -10 6 12 28 NN 4 -5 6 -5 -1

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