(5 5/7 * 3/8 - 5 1/4: 7): 3 + 3 7/28
1) 5 5/7 * 3/8 = 40/7 * 3/8 = 15/7 2) 5 1/4 : 7 = 21/4 * 1/7 = 3/4 3) 15/7 - 3/4 = 60/28 - 21/28 = 39/28 4) 39/28 : 3 = 39/28 * 1/3 = 13/28 5) 13/28 + 3 7/28 = 3 20/28 = 3 4/7