## Intermediate Algebra for College Students (7th Edition)

$\dfrac{\ln{20}}{\ln{9}}$
Isolate $x$ on the left side by dividing $\ln{9}$ on both sides of the equation to obtain: $x = \dfrac{\ln{20}}{\ln{9}}$ Thus, the missing expression in the given statement is: $\dfrac{\ln{20}}{\ln{9}}$