(4 5/13 + 2 8/13) - (1 12/13 + 3 7/13) = 1 7/13
1) 5 8 13 2) 12 7 19 6 3) 13 6 7
4--- + 2--- = 6----- = 7 1--- + 3--- = 4---- = 5--- 6--- - 5--- = 1---
13 13 13 13 13 13 13 13 13 13
4 5/13 + (2 8/13-1 12/13) + 3 7/13 = 8 8/13
1) 8 12 13+8-12 9 2) 5 9 7 21 8
2--- - 1--- = ---------- = --- 4--- + --- + 3--- = 7---- = 8---
13 13 13 13 13 13 13 13 13