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7. For the following system of equations, find the values of r, y, and z using the matrix inversion technique (not Cramer's Rule). Show all

7. For the following system of equations, find the values of r, y, and z using the matrix inversion technique (not Cramer's Rule). Show all intermediate steps. x + 2y - z = 11 2x - y + 32 = 7 7x - 3y - 2z = 2

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