To solve the equation \(-9z = -207\), we can divide both sides by \(-9\):
\[ z = \frac{-207}{-9} \]
This simplifies to:
\[ z = \frac{207}{9} \]
Next, we divide \(207\) by \(9\):
\[ z = 23 \]
Therefore, the solution to the equation is:
\[ \boxed{23} \]