Solve the system: {x+y+z=62x−y+z=3x+2y−z=2\begin{cases} x + y + z = 6 \\ 2x - y + z = 3 \\ x + 2y - z = 2 \end{cases}⎩⎨⎧x+y+z=62x−y+z=3x+2y−z=2 What is x+zx + zx+z?
222
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555