help!

if you couldn't tell, i suck at these kinds of problems :(

Let

\(f(x) = \left\{ \begin{array}{cl} -x - 3 & \text{if } x \le 1, \\ \frac{x}{2} + 1 & \text{if } x > 1. \end{array} \right.\)

Find the sum of all values of x such that f(x) = 0.

edit: just kidding i finally figured out how to do these, the answer was -3 i literally just had to plug in x=0..