(5/8y - 2 3/4) х 8 = 3

[tex] ( \frac{5}{8} y - 2 \frac{3}{4} ) * 8 = 3 \\ \\ \frac{40}{8}y- \frac{88}{4} =3 \\ \\ 5y-22=3 \\ \\ 5y=3+22 \\ \\ 5y=25 \\ \\ y=5.[/tex]

Ответ: у = 5.