To multiply the expression \( (5h - 15) \) by \( 5 \), you can distribute the \( 5 \) to each term inside the parentheses:
\[ 5(5h - 15) = 5 \cdot 5h - 5 \cdot 15 \]
Now, perform the multiplication:
\[ = 25h - 75 \]
So, the result of multiplying \( (5h - 15) \) by \( 5 \) is:
\[ 25h - 75 \]