Найдите значение выражения.

(12 1/2-3 5/6)-(2 8/9+1 4/5)-(5 5/8-4 3/4)-(6 9/40-5 11/90)

Срочно.

12 1/2 - 3 5/6 = 12 3/6 - 3 5/6 = 11 9/6 - 3 5/6 = 8 4/6 = 8 2/3 
2 8/9 + 1 4/5 = 2 40/45 + 1 36/45 = 3 76/45 = 4 31/45 
5 5/8 - 4 3/4 = 5 5/8 - 4 6/8 = 4 13/8 - 4 6/8 = 7/8 
6 9/40 - 5 11/90 = 6 81/360 - 5 44/360 = 1 37/360 
---------------------------------------
8 2/3 - 4 31/45 - 7/8 - 1 37/360 = 8 240/360 - 4 248/360 - 315/360 - 1 37/360 =
= 8 240/360 - 5 600/360 = 8 24/36 - 5 60/36 = 8 24/36 - 6 24/36 = 2 
ОТВЕТ 2 

Спасибо большое))