16) 7-11 11/15

$$7 - 11 \frac{11}{15} = 7 - \frac{11 \cdot 15 + 11}{15} = 7 - \frac{165 + 11}{15} = 7 - \frac{176}{15} = \frac{7 \cdot 15 - 176}{15} = \frac{105 - 176}{15} = \frac{-71}{15} = -4 \frac{11}{15}$$
Ответ: $$-4 \frac{11}{15}$$