Given that "a" is some nonzero constant, calculate the inverse of the following matrix: 5 -За 7 9. 9 За (45+21a) -7 5 1 9 7 (45 – 21a) -За 5 9 За (45 – 21a) -7 5 1 9 7 (45+ 21a) - За 5

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A: see below the answer

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