What value of q is a solution to this equation?

To solve the equation \(-25 = -4q + 9q\), we first simplify the right side:

\[ -4q + 9q = 5q \]

So the equation becomes:

\[ -25 = 5q \]

Next, we solve for \(q\) by dividing both sides by 5:

\[ q = \frac{-25}{5} \]

\[ q = -5 \]

Thus, the value of \(q\) that is a solution to the equation is:

\[ \boxed{-5} \]