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-2 ] [-1 0.5 -1 | 0 ] To solve this system using Gaussian elimination, we start by subtracting two times the first row from the second row, and adding one times the first row to the third row, which gives: [ 3 2 -1 | 1 ] [ 0 -6 6 | -4 ] [ 0 2.5 -2 | 1 ] Next, we subtract 0.42 times the second row