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If A=[{:(0,6,7),(-6,0,8),(7,-8,0):}],B=[...

If `A=[{:(0,6,7),(-6,0,8),(7,-8,0):}],B=[{:(0,1,1),(1,0,2),(1,2,0):}],C=[{:(2,),(-2,),(3,):}]`.
Calculate AC, BC and (A+B)C. Also , verify that (A+B)C=AC+BC.

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