Answer
$\begin{bmatrix}
10 & 8\\
-59 & 9\\
\end{bmatrix}$
Work Step by Step
We first add the two matrices within the parentheses to create matrix X:
X = $\begin{bmatrix}
0-6 & -3+3\\
7+8 & 2+1\\
\end{bmatrix}$ = $\begin{bmatrix}
-6 & 0\\
15 & 3\\
\end{bmatrix}$
We then multiply matrix X by -3 to create matrix A:
A = $\begin{bmatrix}
-6(-3) & 0(-3)\\
15(-3) & 3(-3)\\
\end{bmatrix}$ = $\begin{bmatrix}
18 & 0\\
-45 & -9\\
\end{bmatrix}$
We then multiply the matrix not in the parentheses by 2 to create matrix B:
B = $\begin{bmatrix}
4(2) & -4(2)\\
7(2) & -9(2)\\
\end{bmatrix}$ = $\begin{bmatrix}
8 & -8\\
14 & -18\\
\end{bmatrix}$
We then perform A - B:
$\begin{bmatrix}
18-8 & 0+8\\
-45-14 & -9+18\\
\end{bmatrix}$ = $\begin{bmatrix}
10 & 8\\
-59 & 9\\
\end{bmatrix}$
