(2 5\6 + 1 7\9) • 3 3\5 + (2 5\6 - 1 7\9) •(-2 16\19)

Решите задачу:

$(2 \frac{5}{6}+1 \frac{7}{9})*3 \frac{3}{5}+(2 \frac{5}{6}-1 \frac{7}{9})*(-2 \frac{16}{19})=$
$=(\frac{17}{6}+\frac{16}{9})*\frac{18}{5}+(\frac{17}{6}-\frac{16}{9})*(-\frac{54}{19})=$
$=(\frac{51}{18}+\frac{32}{18})*\frac{18}{5}-(\frac{51}{18}-\frac{32}{18})*\frac{54}{19}=$
$=\frac{83}{18}*\frac{18}{5}-\frac{19}{18}*\frac{54}{19}= \frac{83}{5}-3= 16\frac{3}{5}-3=13\frac{3}{5}$