Answer
$X=\left[ \begin{matrix}
17 & -3 \\
2 & -9 \\
-7 & 16 \\
\end{matrix} \right]$
Work Step by Step
Consider the matrix equation, $A-X=4B$.
This implies that, $X=A-4B$
Now we will consider,
$\begin{align}
& X=A-4B \\
& =\left[ \begin{matrix}
-3 & -7 \\
2 & -9 \\
5 & 0 \\
\end{matrix} \right]-4\left[ \begin{matrix}
-5 & -1 \\
0 & 0 \\
3 & -4 \\
\end{matrix} \right] \\
& =\left[ \begin{matrix}
-3 & -7 \\
2 & -9 \\
5 & 0 \\
\end{matrix} \right]-\left[ \begin{matrix}
-20 & -4 \\
0 & 0 \\
12 & -16 \\
\end{matrix} \right] \\
& =\left[ \begin{matrix}
17 & -3 \\
2 & -9 \\
-7 & 16 \\
\end{matrix} \right]
\end{align}$
