( 12 3/8 : 2 1/16 - 5 5/21) * 7/8 + 3 2/15 = (99/8 : 33/16 - 110/21)*7/8 + 47/15 = (99/8 * 16/33 - 110/21)*7/8 + 47/15 = (6-110/21)*7/8 + 47/15 = (126/21-110/21)*7/8 + 47/15 = 16/21 * 7/8 + 47/15 = 2/3 + 47/15 = 10/15 + 47/15 = 57/15 = 3 12/15 = 3 4/5