Решите пожалуйста (2/7:3/7+(4 1/2-3 5/6) *3 1/3) : (6 1/2 : 9)

Решите задачу:

$( \frac{2}{7} \times \frac{7}{3} + ( \frac{9}{2} - \frac{23}{6} ) \times \frac{10}{3} ) \div ( \frac{13}{2} \times \frac{1}{9} ) = \\ = (2 \times \frac{1}{3} + \frac{2}{3} \times \frac{10}{3}) \div \frac{13}{18} = \\ = ( \frac{2}{3} + \frac{20}{9} ) \times \frac{18}{13} = \frac{26}{9} \times \frac{18}{13} = 2 \times 2 = 4$