How do you simplify 6(3n - 5)?

$18 n - 30$
To simplify this expression we must multiply each term within the parenthesis, ($\textcolor{b l u e}{3 n - 5}$), by $\textcolor{red}{6}$:
$\textcolor{red}{6} \left(\textcolor{b l u e}{3 n - 5}\right) \to \left(\textcolor{red}{6} \cdot \textcolor{b l u e}{3 n}\right) - \left(\textcolor{red}{6} \cdot \textcolor{b l u e}{5}\right) \to 18 n - 30$