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$\begin{tabular}{|c|c|} \hline $x$ & $y$ \\ \hline<br/>18 & 130 \\ \hline<br/>23 & 160 \\ \hline<br/>26 & 178 \\ \hline \end{tabular}$<br/><br/>For line $h$, the table shows three values of $x$ and their corresponding values of $y$. Line $k$ is the result of translating line $h$ down 5 units in the $xy$-plane. What is the $x$-intercept of line $k$?