Tìm x biết ​\(\begin{array}{I} \frac{{ - 3}}{5} + x - \frac{1}{5} = \frac{{ - 3}}{2} \end{array} \)

* Hướng dẫn giải

Ta có:

\(\begin{array}{I} \frac{{ - 3}}{5} + x - \frac{1}{5} = \frac{{ - 3}}{2}\\ x - \left( {\frac{3}{5} + \frac{1}{5}} \right) = \frac{{ - 3}}{2}\\ x - \frac{4}{5} = \frac{{ - 3}}{2}\\ x = \frac{{ - 3}}{2} + \frac{4}{5}\\ x = - \frac{7}{{10}} \end{array} \)