д) 1 5/9 - (s + 4/9) = 2/3;

Решение:

\[ \frac{14}{9} - \left( s + \frac{4}{9} \right) = \frac{2}{3} \] \[ \frac{14}{9} - s - \frac{4}{9} = \frac{2}{3} \] \[ \frac{10}{9} - s = \frac{6}{9} \] \[ s = \frac{10}{9} - \frac{6}{9} \] \[ s = \frac{4}{9} \]

Ответ: s = 4/9