1 3/10 - (4 - 2 1/3) : 1 3/7 + 1/5 = 13/10 - (4 - 7/3) : 10/7 + 1/5 = 13/10 - 5/3 * 7/10 + 1/5 = 13/10 - 1/3 * 7/2 + 1/5 =13/10 - 7/6 + 1/5 = 1/3