If \(\mathrm{A}=\left[\begin{matrix}\mathrm{a} & \mathrm{c} & -1 \\ \mathrm{b} & 0 & 5 \\ 1 & -5 & 0\end{matrix}\right]\…

If \(\mathrm{A}=\left[\begin{matrix}\mathrm{a} & \mathrm{c} & -1 \\ \mathrm{b} & 0 & 5 \\ 1 & -5 & 0\end{matrix}\right]\) is a skew-symmetric matrix, then the value of \(2\mathrm{a}-(\mathrm{b}+\mathrm{c})\) is :