Solve for: c-9 >-13

Expression: $c-9 > -13$

Move the constant to the right-hand side and change its sign

$c > -13+9$

Calculate the sum

$\begin{align*}&c > -4 \\&\begin{array} { l }c \in \langle-4, +\infty\rangle\end{array}\end{align*}$