52.-7-(-10).

52. $$\frac{-7}{12} - (-\frac{5}{6}) = \frac{-7}{12} + \frac{5}{6} = \frac{-7}{12} + \frac{10}{12} = \frac{3}{12} = \frac{1}{4}$$

Ответ: $$\frac{1}{4}$$