Mathematics · Matrices

Let A and B be two square matrices such that A + 2B = [1 2 06 -3 3-5 3 1] and 2A - B = [2 -1 52 -1 60 1 2]. If Tr(A) denotes the sum of all diagonal elements of the matrix A, then the value of Tr(A) - Tr(B) is equal to:

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