To solve the equation \( \frac{3}{10} a - 18 = 6 \), follow these steps:
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Add 18 to both sides to isolate the term with \( a \):
\[ \frac{3}{10} a - 18 + 18 = 6 + 18 \]
This simplifies to:
\[ \frac{3}{10} a = 24 \]
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Multiply both sides by the reciprocal of \(\frac{3}{10}\), which is \(\frac{10}{3}\):
\[ a = 24 \times \frac{10}{3} \]
Simplifying that:
\[ a = \frac{240}{3} \]
\[ a = 80 \]
Thus, the solution is:
\[ \boxed{80} \]