7 8/13+11 5/13-4 3/17
7 8/13 + 11 5/13 - 4 3/17 = 14 14/17 1) 7 8/13 + 11 5/13 = 18 13/13 = 19 2) 19 - 4 3/17 = 18 17/17 - 4 3/17 = 14 14/17