(4 1/5-1 2/7) x5/6+(3 1/2 +1 2/9) x 5/13 =
(4 7/35 - 1 10/35) x 5/6 + (3 9/18 + 1 4/18) x 5/13 =
(3 35/35 - 1 10/35) x 5/6 + 4 13/18 x 5/13 =
2 25/35 x 5/6 + 85/18 x 5/13 =
95/35 x 5/6 + 425/234 =
95/42 + 425/234 =
2 11/42 + 1 191/234 =
2 429/1638 + 1 1337/1638 =
3 1766/1638 =
4 128/1638 =
4 64/819
uff... mam nadzieję, że się połapiesz
