It seems like you have a couple of equations that potentially need to be solved or simplified. I will address both interpretations:

1. **If you're simplifying the equation \( \frac{x}{18} = -\frac{4}{9} \)**:
- To solve for \( x \), you can multiply both sides by 18:

\[
x = -\frac{4}{9} \times 18
\]

- Simplifying this:

\[
x = -4 \times 2 = -8
\]

So, \( x = -8 \).

2. **If you're trying to express a second part, such as \( \frac{x}{18} = -\frac{4}{9} \)**, then based on my calculations above, the solution is \( x = -8 \).

If there's something specific you wanted me to do with these equations or if there's a different equation you wanted to work with, please let me know!