To rewrite the expression \(12n + 8\) by dividing it by 2, you can proceed as follows:
\[ \frac{12n + 8}{2} \]
Now, divide each term in the expression by 2:
\[ \frac{12n}{2} + \frac{8}{2} = 6n + 4 \]
Thus, the expression \(12n + 8\) rewritten by dividing it by 2 is:
\[ 6n + 4 \]