To solve for \( v \) in terms of \( w \), \( x \), and \( y \) from the equation \( x = -\frac{1}{y} vw \), we need to isolate \( v \).
Starting with the equation:
\[ x = -\frac{1}{y} vw \]
We can multiply both sides by \( -y \) to eliminate the fraction:
\[ -x \cdot y = vw \]
Next, to solve for \( v \), we divide both sides by \( w \):
\[ v = \frac{-xy}{w} \]
So, \( v \) in terms of \( w \), \( x \), and \( y \) is:
\[ \boxed{v = \frac{-xy}{w}} \]