Tìm x, biết: \(3.\left| x \right| - \dfrac{1}{3} = \dfrac{8}{3}\)

* Hướng dẫn giải

\(\begin{array}{l}c)\,3.\left| x \right| - \dfrac{1}{3} = \dfrac{8}{3}\\\,\,\,\,3.\left| x \right|\,\,\,\,\,\,\,\,\,\, = \dfrac{8}{3} + \dfrac{1}{3}\\\,\,\,\,3.\left| x \right|\,\,\,\,\,\,\,\,\,\, = 3\\\,\,\,\,\,\,\,\,\left| x \right|\,\,\,\,\,\,\,\,\,\, = 1\\ \Rightarrow x = 1;\,x =  - 1\end{array}\)

Vậy \(x = 1\) hoặc \(x =  - 1\)