г) -8/9 - (n - 1) = 7/18;

Решение:

\[ -\frac{8}{9} - (n - 1) = \frac{7}{18} \] \[ -\frac{16}{18} - n + 1 = \frac{7}{18} \] \[ 1 - n = \frac{7}{18} + \frac{16}{18} \] \[ 1 - n = \frac{23}{18} \] \[ n = 1 - \frac{23}{18} \] \[ n = \frac{18}{18} - \frac{23}{18} \] \[ n = -\frac{5}{18} \]

Ответ: n = -5/18