2 : 3 1/5 + (3 1/4 - 2/3) : 3 - (2 5/18 - 17/36) : 65/18 = 71/72
1) 2 : 3 1/5 = 2 : 16/5 = 2 * 5/16 = 10/16 = 5/8
2) 3 1/4 - 2/3 = 3 3/12 - 8/12 = 2 15/12 - 8/12 = 2 7/12
3) 2 7/12 : 3 = 31/12 * 1/3 = 31/36
4) 2 5/18 - 17/36 = 2 10/36 - 17/36 = 1 46/36 - 17/36 = 1 29/36
5) 1 29/36 : 65/18 = 65/36 * 18/65 = 18/36 = 1/2
6) 5/8 + 31/36 = 45/72 + 62/72 = 107/72
7) 107/72 - 1/2 = 107/72 - 36/72 = 71/72