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Given A=[{:(1 " "-1 " "1),(1 " "-2 ...

Given `A=[{:(1 " "-1 " "1),(1 " "-2 " "-2),(2 " "1 " "3):}] and B=[{:(-4 " "4" "4),(-7 " "1 " "3),(5 " "-3 " "-1):}]`, find AB and use this result in solving the following system of equation
x-y+z=4,
x-2y-2z=9
2x+2y+3z=1

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