Simplify: $-8x - 12 + 3x - 5x + 9$.
$
\begin{equation}
\begin{aligned}
-8x - 12 + 3x - 5x + 9 =& -8x + 3x - 5x - 12 + 9
&& \text{Commutative Property}
\\
=& (-8 + 3 - 5)x - 12 + 9
&& \text{Distributive Property}
\\
=& -10x - 3
&& \text{Combine like terms}
\end{aligned}
\end{equation}
$
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