Mathematics, 27.11.2019 20:31 meababy2009ow9ewa
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...
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