Решение:
$$(-\frac{7}{18} + \frac{11}{12}) : (-\frac{19}{48}) = (-\frac{7 \cdot 2}{18 \cdot 2} + \frac{11 \cdot 3}{12 \cdot 3}) : (-\frac{19}{48}) = (-\frac{14}{36} + \frac{33}{36}) : (-\frac{19}{48}) = \frac{33 - 14}{36} : (-\frac{19}{48}) = \frac{19}{36} : (-\frac{19}{48}) = \frac{19}{36} \cdot (-\frac{48}{19}) = -\frac{19 \cdot 48}{36 \cdot 19} = -\frac{48}{36} = -\frac{12 \cdot 4}{12 \cdot 3} = -\frac{4}{3} = -1 \frac{1}{3}$$
Ответ: -1 \frac{1}{3}