Simplify 9/11z − 4/11z

To simplify the expression \( \frac{9}{11z} - \frac{4}{11z} \), we can combine the two fractions since they have the same denominator.

\[
\frac{9}{11z} - \frac{4}{11z} = \frac{9 - 4}{11z} = \frac{5}{11z}
\]

So, the simplified form is

\[
\frac{5}{11z}
\]