10-(3 5/11+1 8/11)+4 2/11
10-(3 5/11+1 8/11)+4 2/11=7 1) 3 5/11+1 8/11=4 13/11=5 2/11 2) 10-5 2/11=9 11/11-5 2/11=4 9/11 3) 4 9/11+4 2/11=6 11/11=7