To solve the equation \(-8m = 16\), you should divide both sides of the equation by \(-8\). This will isolate the variable \(m\).
So, dividing both sides by \(-8\):
\[ \frac{-8m}{-8} = \frac{16}{-8} \]
This simplifies to:
\[ m = -2 \]
Therefore, you should divide both sides by \(-8\) to solve for \(m\).