If $A=\left[\begin{matrix}1 & 12 & 4y \ 6x & 5 & 2x \ 8x & 4 & 6\end{matrix}\right]$ is a symmetric matrix, then $(2x+y)$ is

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If \(A=\left[\begin{matrix}1 & 12 & 4y \\ 6x & 5 & 2x \\ 8x & 4 & 6\end{matrix}\right]\) is a symmetric matrix, then \((…