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Question Number 20798 by ANTARES_VY last updated on 03/Sep/17

$$\{\begin{array}{l}4\mathit{x}-\mathit{y}=11\\ 2\mathit{y}+5\mathit{x}=5\\ \mathit{x}-2\mathit{z}=9\end{array}\mathit{z}+\mathit{y}-\mathit{x}=?$$

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