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Determine the product [[-4, 4, 4], [-7,...

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 – 2z = 9, 2x + y + 3z = 1`

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