2) 4/7 x = 2/7

\( \frac{4}{7} x = \frac{2}{7} \implies x = \frac{2}{7} : \frac{4}{7} = \frac{2}{7} \cdot \frac{7}{4} = \frac{2}{4} = \frac{1}{2} \)

Ответ: 1/2