problem: If $9^{18n}=27^{24}$, find $n$.
solution: Expressing both sides of the equation in terms of 3 as a base, we get $(3^2)^{18n}=(3^3)^{24}$, or $3^{36n}=3^{72}$. Setting the exponents equal, we get that $36n=72$, or $n=\frac{72}{36}=\boxed{2}$.