б) $$5 - \frac{7}{13} = \frac{5\cdot13}{13} - \frac{7}{13} = \frac{65}{13} - \frac{7}{13} = \frac{65-7}{13} = \frac{58}{13} = 4\frac{6}{13}$$
Ответ: $$4\frac{6}{13}$$