1 7/9 + (6 3/4 : 3,125 - 2,5 : 3 1/8) × 7,5 - 2 8/15 = Пжпжпжпж даю 20 б

Решите задачу:

$\frac{17}{9} + (6 \frac{3}{4} \div 3.125 - 2.5 \div 3 \frac{1}{8} ) \times 7.5 - 2 8/15 = \\ \frac{17}{9} + ( \frac{27}{4} \div 3.125 - 2.5 \div \frac{25}{8} ) \times 7.5 - 38/15 = \\ \frac{17}{9} + (2.16 - 0.8) \times 7.5 - 38/15= \\ \frac{17}{9} + 1.36 \times 7.5 - 38/15= \\ \frac{17}{9} + 10.2 - 38/15= 9.5$