[x-4 Let A = -3 -6 -71 [1 3 0 x+1 -3 10 and B = 3 0 0 Lo a) Find values of x for which the matrix A is singular. b) Find a matrix X such that (A-1)TX = B if x = −1. c) Is the linear system has unique solution at x = −5. Justify.

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