Let \[f(x) = \left\{
\begin{array}{cl}
2x + 1 & \text{if } x \le 3, \\
8 - 4x & \text{if } x > 3.
\end{array}
\right.\]Find the sum of all values of $x$ such that $f(x) = 0.$
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Let \[f(x) = \left\{
\begin{array}{cl}
2x + 1 & \text{if } x \le 3, \\
8 - 4x & \text{if } x > 3.
\end{array}
\right.\]Find the sum of all values of $x$ such that $f(x) = 0.$
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
-\frac{1}{2}
Let \[f(x) = \left\{
\begin{array}{cl}
2x + 1 & \text{if } x \le 3, \\
8 - 4x & \text{if } x > 3.
\end{array}
\right.\]Find the sum of all values of $x$ such that $f(x) = 0.$
train