Answer
$q=-4$
Work Step by Step
$\begin{align*}
0-4&=4+q-4 &\text{Subtract 4 from each side of the equation.}\\
-4&=q &\text{Simplify}.
\end{align*}$
Check if the solution is correct by substituting $-4$ to the variable in the original equation:
$\begin{align*}
0&=4+q\\
0&\stackrel{?}{=}4+(-4)\\
0&\stackrel{\checkmark}{=}0
\end{align*}$
Thus, the solution is $q=-4$.
