Evaluate the expression LaTeX: \displaystyle 4 A - 5 B + 7 C
LaTeX: A = \left[\begin{matrix}-3 & 9 & -3\\6 & 7 & -2\\-8 & 5 & -8\\-3 & -8 & -3\end{matrix}\right],\quad\quad B = \left[\begin{matrix}2 & -7 & -5\\2 & 9 & -4\\-2 & -3 & 1\\-5 & -4 & 6\end{matrix}\right], \text{ and } \quad C = \left[\begin{matrix}0 & -6 & -3\\7 & 9 & 9\\-3 & 5 & 6\\8 & 2 & -7\end{matrix}\right].

The sum is LaTeX: \displaystyle \left[\begin{matrix}-22 & 29 & -8\\63 & 46 & 75\\-43 & 70 & 5\\69 & 2 & -91\end{matrix}\right] .