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Solve[{{1,-2,3,-1},{2,0,1,0},{1,1,0,-1},{0,1,-2,1}}.{x1,x2,x3,x4}=={1,2,0,3}]
Solve[{{1,-2,3,-1},{2,0,1,0},{1,1,0,-1},{0,1,-2,1}}.{x1,x2,x3,x4}=={1,2,0,3}]
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