Б) \(5-\frac{6}{7}\)

\(5-\frac{6}{7} = \frac{5 \times 7}{7} - \frac{6}{7} = \frac{35}{7} - \frac{6}{7} = \frac{35-6}{7} = \frac{29}{7} = 4\frac{1}{7}\)

Ответ: \(4\frac{1}{7}\).