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Given : $ A = \begin{bmatrix} 1 & -1 & 1 \\ 1 & -2 & -2 \\ 2 & 1 & 3 \end{bmatrix}. B = \begin{bmatrix} -4 & 4 & 4 \\ -7 & 1 & 3 \\ 5 & -3 & -1 \end{bmatrix} $ Find AB and use this result in solving the following system of equations : $ \begin{array} xx - y + z = 4 \\ x - 2y - 2z = 9 \\ 2x + y +3z = 1 \end{array} $

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