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Algebra Difficulty 3.0 AMC 10/12 Find the answer United Kingdom

The numbers $x$ , $y$ and $z$ satisfy the equations $9x+3y-5z=-4$ and $5x+2y-2z=13$ . What is the mean of $x$ , $y$ and $z$ ?

(A) $10$ (B) $11$ (C) $12$ (D) $13$ (E) $14$

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