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If A=[[1,2,3],[-1,0,2],[1,-3,1]], B=[[4,...

If `A=[[1,2,3],[-1,0,2],[1,-3,1]], B=[[4,5,6],[-1,0,1],[2,1,2]], C=[[-1,-2,1],[-1,2,3],[-1,-2,2]]` find A-2B+3C. Also verify that (A+B)+C=A+(B+C).

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