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Let ?+?+?=7 where ?,?,?∈ℝ. Prove that ?^2+y^2+z^2≥7/3

Let ?+?+?=7 where ?,?,?∈ℝ.

Prove that ?^2+y^2+z^2≥7/3

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Let ?+?+?=7 where ?,?,?∈ℝ. Prove that ?^2+y^2+z^2≥7/3

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