Tìm x biết ​\(\begin{array}{l} - \frac{7}{5}.x - \frac{4}{3} = \frac{2}{3} \end{array}\)

* Hướng dẫn giải

Ta có:

\(\begin{array}{l} - \frac{7}{5}.x - \frac{4}{3} = \frac{2}{3}\\ - \frac{7}{5}.x = \frac{2}{3} + \frac{4}{3}\\ - \frac{7}{5}.x = \frac{6}{3}\\ - \frac{7}{5}x. = 2\\ x = 2:\left( { - \frac{7}{5}} \right)\\ x = - \frac{{10}}{7} \end{array}\)