Sendo \( M \, = \, \begin {bmatrix} 2 \,\,\,\,\,\, x \,\,\,\,\,\, y \\ z \,\,\,\, 4 \,\,\,\,\, -1 \\ 1 \,\,\,\,\,\, 0 \,\,\,\,\,\, 3 \end {bmatrix}, \, N \, = \, \begin {bmatrix} 4 \,\,\,\,\,\, 6 \,\,\,\,\,\, 1 \\ y \,\,\,\,\,\, 1 \,\,\,\,\,\, 0 \\ 2 \,\,\,\,\,\, -1 \,\,\,\,\,\, 4 \end {bmatrix} \,\, e \,\, A \, = \, \begin {bmatrix} 6 \,\,\,\,\,\, 4 \,\,\,\,\,\, 0 \\ 4 \,\,\,\,\,\, 5 \,\,\,\,\,\, -1 \\ 3 \,\,\,\,\,\, -1 \,\,\,\,\,\, 7 \end {bmatrix} \) matrizes quadradas tais que M + N = A, é CORRETO afirmar que x + y + z é igual a: