Given that \( a \begin{bmatrix}{2} && {6} \\ {1} && {4}\end{bmatrix} = \begin{bmatrix}{x} && {27} \\ {y} && {z}\end{bmatrix} \) for some real number \(a\), find \(x+z\).

A. \(\frac43\)

B. \( \frac{27}2\)

C. 26

D. 27

E. 48

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