28. 5x-2 / 6 = 5/7

Решение:

1. \[ \frac{5x-2}{6} = \frac{5}{7} \]
2. \[ 7(5x-2) = 6 \times 5 \]
3. \[ 35x - 14 = 30 \]
4. \[ 35x = 30 + 14 \]
5. \[ 35x = 44 \]
6. \[ x = \frac{44}{35} \]

Ответ: x = 44/35