Problem:
Find all real solutions to $3^{4-8 x}3^{3 x+9} = 3^{-8 x-21}$
Answer:
$\left\{\left\{x\to -\frac{34}{3}\right\}\right\}$
{'source': 'AMPS', 'file': 'amps/mathematica/algebra/exponential_equations/13619.txt'}