Let $x$, $y$, and $z$ be real numbers such that
\[\cos x + \cos y + \cos z = \sin x + \sin y + \sin z = 0.\]Find the sum of all possible values of $\cos 2x + \cos 2y + \cos 2z.$
Question:
Let $x$, $y$, and $z$ be real numbers such that
\[\cos x + \cos y + \cos z = \sin x + \sin y + \sin z = 0.\]Find the sum of all possible values of $\cos 2x + \cos 2y + \cos 2z.$
Answer:
Let's think step by step.

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Let $x$, $y$, and $z$ be real numbers such that
\[\cos x + \cos y + \cos z = \sin x + \sin y + \sin z = 0.\]Find the sum of all possible values of $\cos 2x + \cos 2y + \cos 2z.$
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