To solve the equation \(-6x = 48\) for \(x\), you should divide both sides of the equation by \(-6\).
Here's how it looks:
\[ \frac{-6x}{-6} = \frac{48}{-6} \]
This simplifies to:
\[ x = -8 \]
So, the correct action to take is to divide both sides by -6.