To solve the equation \(\frac{z^?}{z^{6}} = z^{18}\), we can use the properties of exponents.
Starting with:
\[ \frac{z^?}{z^{6}} = z^{18} \]
We can rewrite the left-hand side using the property \(\frac{a^m}{a^n} = a^{m-n}\):
\[ z^{? - 6} = z^{18} \]
Since the bases are the same, we can set the exponents equal to one another:
\[ ? - 6 = 18 \]
To find \(?\), we add 6 to both sides:
\[ ? = 18 + 6 \]
\[ ? = 24 \]
Thus, the missing value for \(?\) is \(\boxed{24}\).