(10 1/7-y) : 1 1/7+2 5/8=7 1/8

[latex](10 \frac{1}{7} -y):1 \frac{1}{7} +2 \frac{5}{8} =7 \frac{1}{8} \\ (10 \frac{1}{7} -y):1 \frac{1}{7} =7 \frac{1}{8} -2 \frac{5}{8} \\ (10 \frac{1}{7} -y):1 \frac{1}{7} =4 \frac{1}{2} \\ 10 \frac{1}{7} -y=4 \frac{1}{2} *1 \frac{1}{7} \\ 10 \frac{1}{7} -y= \frac{9}{2} * \frac{8}{7} \\ 10 \frac{1}{7} -y=5 \frac{1}{7} \\ y=10 \frac{1}{7} -5 \frac{1}{7} \\ y=5[/latex]