1/9+2/3+5/6=
2/5+7/9+1/15=
3/8+5/6+2/3=
5/12+3/4+1/7=

х-3/7=1
х-3/20=7/10
х-3/20=1
х-5/18=1/3

2/18+12/18+15/18=29/18=1 целая 11/1818/45+35/45+3/45=56/45=1 целая 11/459/24+20/24+16/24=45/24=1 целая 21/24 = 1 целая 7/8