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Find a sequence of elementary matrices that can be used to write the matrix in row-echelon form. 1 -2 -1 O 0 3 6 -3

Find a sequence of elementary matrices that can be used to write the matrix in row-echelon form.

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1 -2 -1 O 0 3 6 -3 -7 14 9 1 1 0 0 1 10 0 1 0 0 O 0 1/3 0 010 0 1 0 0 01 7 01 0 0 1/2 1 0 0 1 0 0 10 0 O 01 0 0 1/3 0 0 1 0 0 0 1/2 JLO 0 1701 10 0 1 0 0 .0 0 O 010 01 0 1/3 0 -7 0 1 0 0 1/2 0 0 1] 1 0 0 0 10 0 O 0 1/3 0 010 0 1 0 0 1/2 ] [ -7 0 1] 10 0 1 0 0 O 010 01 0 7010 1/2

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