Tìm x, biết: \[x:\frac{7}{{12}} = \frac{1}{2} - \frac{2}{7}\]

Ta có:

\[x:\frac{7}{{12}} = \frac{1}{2} - \frac{2}{7}\]

\[x:\frac{7}{{12}} = \frac{3}{{14}}\]

\[x = \frac{3}{{14}} \times \frac{7}{{12}}\]

\[x = \frac{1}{8}\]

Vậy \[x = \frac{1}{8}\]

Chọn A