7. Given the following augmented matrix, list all the variables {x1, ... , X5}. Indicate which are free variable, and for the other variables, give an equation for each using the free variables. [1 -2 0 1 -5 1 0 0 -7 8 3 5

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Q: D = 3 1 5 0 -4 5 -2 -4 3

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Q: Some entries of a 3x3 matrix A and its are given as follows; 2 3 -4 A = and adj(A) = a 3.

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