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Determine the product[(-4,4,4)(-7,1,3)(5,-3,-1)][(1,-1,1)(1,-2,-2)(2,1,3)], and use it to solve the system of equations :

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Determine the product[(-4,4,4)(-7,1,3)(5,-3,-1)][(1,-1,1)(1,-2,-2)(2,1,3)], and use it to solve the system of equations : x -y + z = 4, x -2y -72 = 9,2x +y+3z = 1.

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where I is the identity matrix

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