Answer
$m=-7$
Work Step by Step
$\begin{align*}
m+9-9&=2-9 &\text{Subtract 9 from each side of the equation.}\\
m&=-7 &\text{Simplify}.
\end{align*}$
Check if the solution is correct by substituting $-7$ to the variable in the original equation:
$\begin{align*}
m+9&=2\\
-7+9&\stackrel{?}{=}2\\
2&\stackrel{\checkmark}{=}2
\end{align*}$
Thus, the solution is $m=-7$.
