To solve the equation \( \frac{8}{5}x = -10 \), we can follow these steps:
- First, multiply both sides of the equation by \( \frac{5}{8} \) to isolate \( x \):
\[ x = -10 \cdot \frac{5}{8} \]
- Now, calculate the right side:
\[ x = -\frac{10 \cdot 5}{8} = -\frac{50}{8} = -\frac{25}{4} \]
Therefore, the solution to the equation \( \frac{8}{5}x = -10 \) is
\[ \boxed{-\frac{25}{4}}. \]