Mathematics, 07.11.2019 06:31 devinluck100

Replace the third equation by the sum of itself and -1 times the second equation x-2y-7z=17,-6x+4y+5z=-9,8x+7y=z=-4

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Replace the third equation by the sum of itself and -1 times the second equation x-2y-7z=17,-6x+4y+5...