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row echelon form [[1,-1,3,2,0],[-1,2,-1,2,-3],[-5,8,-9,2,-9],[1,-3,0,-5,5],[4,-4,4,-10,13]]
row echelon form [[1,-1,3,2,0],[-1,2,-1,2,-3],[-5,8,-9,2,-9],[1,-3,0,-5,5],[4,-4,4,-10,13]]
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