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$$\begin{cases}
\sqrt{x+y}+\sqrt{x+3}=y-3\\
\sqrt{x+y}+\sqrt{x}=x+3
\end{cases} $$
\sqrt{x+y}+\sqrt{x+3}=y-3\\
\sqrt{x+y}+\sqrt{x}=x+3
\end{cases} $$
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