Tim x biết: \(x - \frac{3}{5} = \frac{{ - 6}}{7}\)...

B

- Hướng dẫn giải

\(\begin{array}{l}
x - \frac{3}{5} = \frac{{ - 6}}{7}\\
x = \frac{{ - 6}}{7} + \frac{3}{5}\\
x = \frac{{ - 30}}{{35}} + \frac{{21}}{{35}}\\
x = \frac{{ - 9}}{{35}}
\end{array}\)