$x$ | $-11$ | $-10$ | $-9$ | $-8$ |
$f(x)$ | $21$ | $18$ | $15$ | $12$ |
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?
Difficulty: Hard
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