# Find the domain and range of the following real function: $\mathrm{f}\left(\mathrm{x}\right)=\left\{\begin{array}{cc}\mathrm{x}+4,& \mathrm{x}<3\\ 2\mathrm{x}+9,& 3\le \mathrm{x}\le 9\\ 5,& \mathrm{x}>9\end{array}\right\$

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