8 2/3 - 6 3/5 - 2 2/5 + 1 7/9
8 2/3=26/3 6 3/5=33/5 2 2/5=12/5 1 7/9=16/9 26/3-33/5-12/5+16/9=26/3+16/9-45/5= 78/9+16/9-9=94/9-9=94-81/9= 13/9= 1 4/9