To solve the equation \( \frac{5}{3}x - 4 = -9 \), we can follow these steps:
- Add 4 to both sides of the equation:
\[ \frac{5}{3}x - 4 + 4 = -9 + 4 \]
This simplifies to:
\[ \frac{5}{3}x = -5 \]
- Multiply both sides by the reciprocal of \(\frac{5}{3}\), which is \(\frac{3}{5}\):
\[ x = -5 \cdot \frac{3}{5} \]
This simplifies to:
\[ x = -3 \]
So the solution is:
\[ \boxed{x = -3} \]