For real numbers $x,$ $y,$ and $z,$ find the minimum value of
\[2x^2 + 5y^2 + 2z^2 + 4xy - 4yz - 2z - 2x.\]
Question:
For real numbers $x,$ $y,$ and $z,$ find the minimum value of
\[2x^2 + 5y^2 + 2z^2 + 4xy - 4yz - 2z - 2x.\]
Answer:
Let's think step by step.

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For real numbers $x,$ $y,$ and $z,$ find the minimum value of
\[2x^2 + 5y^2 + 2z^2 + 4xy - 4yz - 2z - 2x.\]
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