7 1/7х-5 1/8х=3 3/8+5 3/4 7 2/8х-5 1/8х=3 3/8+5 6/8 2 1/8х=8 9/8 х=8 9/8:2 1/8 х=73/8:17/8 х=73/8*8/17 х=73/17=4цел5/17