2/9+5/6+11/12= 14/20+7/8+1/5= 5/8+3/5-3/4=

1. 8/36+30/36+33/36 = 71/36
2. 28/40+35/40+8/40 = 71/40
3. 25/40+24/40-30/40 = 19/40