[-54/64 - (1/9:8/27):-1/3]:-81/128

$[\frac{-54}{64} - (\frac{1}{9} ÷ \frac{8}{27}) ÷ \frac{-1}{3}] ÷ \frac{-81}{128}$

$= [\frac{-54}{64} - \frac{3}{8} ÷ \frac{-1}{3}] ÷ \frac{-81}{128}$

$= (\frac{-54}{64} - \frac{-9}{8}) ÷ \frac{-81}{128}$

$= \frac{9}{32} ÷ \frac{-81}{128}$

$= \frac{-4}{9}$