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if A=[{:(3,2,1),(1,2,3),(3,-6,1):}],B=[{...

`if A=[{:(3,2,1),(1,2,3),(3,-6,1):}],B=[{:(1,4,0),(2,-3,0),(1,2,0):}]`
`and C=[{:(1,2,3),(3,2,1),(8,7,9):}],`then find AB-AC.

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The correct Answer is:
`[{:(-9,-9,-20),(-23,-23,-32),(-1,31,-12):}]`
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