в. 5$$\frac{25}{36}$$ - $$x = 1\frac{1}{12} + 2\frac{3}{8}$$.

в. Решим уравнение:

1. $$1\frac{1}{12} + 2\frac{3}{8} = 1\frac{2}{24} + 2\frac{9}{24} = 3\frac{11}{24}$$
2. $$5\frac{25}{36} - x = 3\frac{11}{24}$$
3. $$x = 5\frac{25}{36} - 3\frac{11}{24}$$
4. $$x = 5\frac{50}{72} - 3\frac{33}{72}$$
5. $$x = 2\frac{17}{72}$$

Ответ: $$2\frac{17}{72}$$