Problem:
Find all real solutions to $\frac{9^{9 x+20}}{9^{8 x+17}} = 81^{9 x-23}$
Answer:
$\left\{\left\{x\to \frac{49}{17}\right\}\right\}$
{'source': 'AMPS', 'file': 'amps/mathematica/algebra/exponential_equations/34960.txt'}