To solve for \( x \) in the equation \( \frac{x}{12} = 6 \), you should multiply both sides of the equation by 12.
Here’s how it looks:
\[ \frac{x}{12} = 6 \]
Multiply both sides by 12:
\[ x = 6 \times 12 \]
So, the solution is:
\[ x = 72 \]
Therefore, the correct action to take is multiplying both sides of the equation by 12.