\displaystyle\left(\begin{array}{c} 5 \\ 2\end{array}\right) \left(\begin{array}{c} 3 \\ 1\end{array}\right)\left[ \left(\begin{array}{c} m+n-9 \\ m-4\end{array}\right)-\left(\begin{array}{c} 5 \\ 2\end{array}\right)\left(\begin{array}{c} m+n-14 \\ m-7\end{array}\right)\right]