83/17 - 4 11/17 28 2/21 - (14 17/21 + 11 8/21) (8 5/27 - x) - 2 25/27 =1 25/27

8 3/17 - 4 11/17 = 7 20/17 - 4 11/17 = 3 9/17

28 2/21 - (14 17/21 + 11 8/21) = 1 19/21
1) 14 17/21 + 11 8/21 = 25 25/21 = 26 4/21
2) 28 2/21 - 26 4/21 = 27 23/21 - 26 4/21 = 1 19/21

(8 5/27 - х) - 2 25/27 = 1 25/27
8 5/27 - х = 1 25/27 + 2 25/27 = 3 50/27 = 4 23/27
х = 8 5/27 - 4 23/27 = 7 32/27 - 4 23/27 = 3 9/27
х = 3 1/3