(k-5 3/14)+8 13/14=15-3 9/14 (k-5 3/14)+8 13/14=11 5/14 k-5 3/14=11 5/14-8 13/14 k-5 3/14=2 6/14 k=2 6/14+5 3/14 k=7 9/14