14 1/12 - 1 5/18 = 169/12 - 23/18 = 507/36 - 46/36 = 461/36 = 12 целых 29/36

1 целая 1/12 = 169/12

1 целая 5/18 = 23/18

169/12 - 23/18 = 507-46/36 = 461/36 = 12 целых 29/36