$$5\frac{2}{5} - 1\frac{1}{3} \cdot 6 = \frac{27}{5} - \frac{4}{3} \cdot 6 = \frac{27}{5} - \frac{4 \cdot 6}{3} = \frac{27}{5} - \frac{4 \cdot 2}{1} = \frac{27}{5} - 8 = \frac{27}{5} - \frac{40}{5} = -\frac{13}{5} = -2\frac{3}{5}$$
Ответ: $$-2\frac{3}{5}$$