**Решение:**
a) $$x - 3.22 = -8.19$$
$$x = -8.19 + 3.22$$
$$x = -4.97$$
б) $$2\frac{8}{15} + y = -1\frac{7}{10}$$
$$y = -1\frac{7}{10} - 2\frac{8}{15}$$
$$y = -1\frac{21}{30} - 2\frac{16}{30}$$
$$y = -3\frac{37}{30} = -4\frac{7}{30}$$
**Ответ:**
a) $$x = -4.97$$
б) $$y = -4\frac{7}{30}$$