row reduce {{1,1,0,0,0,0,5},{0,0,1,0,0,1,5},{0,0,1,1,0,0,7},{1,0,0,0,1,0,6},{0,0,0,0,1,1,4},{0,1,0,1,0,0,5},{0,0,0,1,-1,0,0}}

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