Выполним вычисление по действиям:
1) $$4 - \frac{26}{27} = \frac{4 \cdot 27}{27} - \frac{26}{27} = \frac{108 - 26}{27} = \frac{82}{27}$$
2) $$\frac{8}{15} : \frac{82}{27} = \frac{8}{15} \cdot \frac{27}{82} = \frac{8 \cdot 27}{15 \cdot 82} = \frac{4 \cdot 9}{5 \cdot 41} = \frac{36}{205}$$
3) $$\frac{11}{14} + \frac{36}{205} = \frac{11 \cdot 205}{14 \cdot 205} + \frac{36 \cdot 14}{205 \cdot 14} = \frac{2255}{2870} + \frac{504}{2870} = \frac{2759}{2870}$$
4) $$1\frac{1}{10} = \frac{11}{10} = \frac{11 \cdot 287}{10 \cdot 287} = \frac{3157}{2870}$$
5) $$\frac{2759}{2870} - \frac{3157}{2870} = \frac{2759 - 3157}{2870} = \frac{-398}{2870} = -\frac{199}{1435}$$
Ответ: -$$\frac{199}{1435}$$