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A mixture of paint is prepared by mixing 1 part of red pigments with 8 parts of base. In the following table, find the parts of base that need to be added.
\begin{tabular}{|l|c|c|c|c|c|}
\hline Parts of red pigment & 1 & 4 & 7 & 12 & 20 \\
\hline Parts of base & 8 & \( \cdots \) & \( \cdots \) & \( \cdots \) & \( \ldots \) \\
\hline
\end{tabular}
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