Find:
![\begin{gathered}\left[\begin{array}{ccc}x-1&2&5-y\\0&z-1&7\\1&0&a-5\end{array}\right] = \left[\begin{array}{ccc}1&2&3\\0&4&7\\1&0&0\end{array}\right]\end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Dx-1%26amp%3B2%26amp%3B5-y%5C%5C0%26amp%3Bz-1%26amp%3B7%5C%5C1%26amp%3B0%26amp%3Ba-5%5Cend%7Barray%7D%5Cright%5D+%3D+%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26amp%3B2%26amp%3B3%5C%5C0%26amp%3B4%26amp%3B7%5C%5C1%26amp%3B0%26amp%3B0%5Cend%7Barray%7D%5Cright%5D%5Cend%7Bgathered%7D "\begin{gathered}\left[\begin{array}{ccc}x-1&2&5-y\\0&z-1&7\\1&0&a-5\end{array}\right] = \left[\begin{array}{ccc}1&2&3\\0&4&7\\1&0&0\end{array}\right]\end{gathered}")
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