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$\begin{tabular}{|c|c|c|c|c|} $\chi$ & $-11$ & $-10$ & $-9$ & $-8$ \\ \hline $f(x)$ & $21$ & $18$ & $15$ & $12$ \\ \hline \end{tabular}$ The table above shows some values of $x$ and their corresponding values $f(x)$ for the linear function $f$. What is the $x$-intercept of the graph of $y=f(x)$ in the xy-plane?