Tìm x, (x - frac{1}{3} = frac{7}{{26}}.frac{{ - 13}}{6})

* Hướng dẫn giải

\(\begin{array}{l}
x - \frac{1}{3} = \frac{7}{{26}}.\frac{{ - 13}}{6}\\
x - \frac{1}{3} = \frac{{ - 7}}{{12}}\\
x = \frac{{ - 7}}{{12}} + \frac{1}{3}\\
x = \frac{{ - 7}}{{12}} + \frac{4}{{12}}\\
x = \frac{{ - 3}}{{12}} = \frac{{ - 1}}{4}
\end{array}\)