Tìm x biết \(\frac{3}{5}x - \frac{2}{7} = \frac{4}{5}\)

* Hướng dẫn giải

 \(\begin{aligned} &\frac{3}{5}x - \frac{2}{7} = \frac{4}{5}\\ &\frac{3}{5}x = \frac{4}{5} + \frac{2}{7}\\ &\frac{3}{5}x = \frac{{38}}{{35}}\\ &x = \frac{{38}}{{35}}:\frac{3}{5}\\ &x = \frac{{38}}{{21}} \end{aligned}\)