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If = 58 , find the value of x

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The above is a 2x2 matrix and the determinant is given as:

(2 * 9) - (-4 * x) = 58

18 - (-4x) = 58

18 + 4x = 58

4x = 58 - 18

4x = 40

x = 40/4

x = 10

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