To solve for \( v \) in terms of \( w \), \( x \), and \( y \) from the equation
\[ x = -\frac{1}{y} vw, \]
we start by isolating \( vw \) on one side. We can multiply both sides of the equation by \( -y \):
\[ -x y = vw. \]
Next, to express \( v \) in terms of \( w \), we divide both sides by \( w \):
\[ v = \frac{-xy}{w}. \]
Thus, the solution for \( v \) in terms of \( w \), \( x \), and \( y \) is:
\[ v = \frac{-xy}{w}. \]