(5 3/7 : 1 1/14 - 2 5/9) * 18 - 3 4/7 : 1 3/7
5 3/7 : 1 1/14 = 38/7 : 15/14 = 38/7 * 14/15 = 76/15
76/15 - 2 5/9 = 76/15 - 23/9 = (228-115) / 45 = 113/45
113/45 * 18 = 2034/45
3 4/7 : 1 3/7 = 25/7 : 10/7 = 25/7 * 7/10 = 5/2
2034/45 - 5/2 = (4068-225) / 90 = 3843/90 = 42 7/10