Matrices And Determinants

If $$A=\left[\begin{array}{ccc}1 & 2 & 3 \\ -1 & 1 & 2 \\ 1 & 2 & 4\end{array}\right]$$ and \(A_{i j}\) is a cofactor of \(a_{i j}\) then the value of \(a_{21} A_{21}+a_{22} A_{22}+a_{23} A_{23}\) is