Answer
$X=\left[\begin{array}{ll}
17 & -3\\
2 & -9\\
-7 & 16
\end{array}\right]$
Work Step by Step
$ A-X=4B\qquad$ ... add $X$ to both sides
$ A=X+4B\qquad$ ... add $-4B$ to both sides
$A-4B=X$
$X=A-4B$
$X=\left[\begin{array}{ll}
-3 & -7\\
2 & -9\\
5 & 0
\end{array}\right]-4\cdot\left[\begin{array}{ll}
-5 & -1\\
0 & 0\\
3 & -4
\end{array}\right]$
$X=\left[\begin{array}{ll}
-3 & -7\\
2 & -9\\
5 & 0
\end{array}\right]+\left[\begin{array}{ll}
20 & 4\\
0 & 0\\
-12 & 16
\end{array}\right]$
$X=\left[\begin{array}{ll}
17 & -3\\
2 & -9\\
-7 & 16
\end{array}\right]$
