0
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
If $x$ is a real number and $x^2 = 16$, what is the sum of all possible values of $x$?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
0
If $x$ is a real number and $x^2 = 16$, what is the sum of all possible values of $x$?
train