To solve the equation \( 3c = 9 \), you need to isolate \( c \).
You can do this by dividing both sides of the equation by 3:
\[ c = \frac{9}{3} \]
Calculating the right side gives:
\[ c = 3 \]
Therefore, the value of \( c \) that is a solution to the equation is \( c = 3 \).