Given the matrices in Problems 28-31, perform elementary row operations to obtain a zero (or zeros) above
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Given the matrices in Problems 28-31, perform elementary row operations to obtain a zero (or zeros) above and below the 1 in the second column without changing the entries in the first column.
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[D] = 15 01 01 -1 2 52 28 20 4 05 1 7 LO 2 -3
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