To solve for \( x \) in the equation
\[ \frac{x}{-2} = 8, \]
you can start by multiplying both sides of the equation by \(-2\) to isolate \( x \):
\[ x = 8 \times (-2). \]
Calculating the right side gives:
\[ x = -16. \]
Thus, the solution is
\[ \boxed{-16}. \]