Обчисліть (3 1/15-1 1/15:1 3/5 +2/5)*2 1/7-5

Решите задачу:

$(3 \frac{1}{15} - 1 \frac{1}{15} \div 1 \frac{3}{5} + \frac{2}{5} ) \times 2 \frac{1}{7} - 5 = ( \frac{46}{15} - \frac{16}{15} \div \frac{8}{5} + \frac{2}{5} ) \times \frac{15}{7} - 5 = ( \frac{46}{15} - \frac{16}{15} \times \frac{5}{8} + \frac{2}{5} ) \times \frac{15}{7} - 5 = ( \frac{46}{15} - \frac{2}{3} + \frac{2}{5} ) \times \frac{15}{7} - 5 = ( \frac{46}{15} - \frac{10}{15} + \frac{6}{15} ) \times \frac{15}{7} - 5 = \frac{42}{15} \times \frac{15}{7} - 5 = 6 - 5 = 1$