Tìm x biết: \(0,2 + \dfrac{2}{3}x = \dfrac{1}{3}\)

* Hướng dẫn giải

Ta có:

\(0,2 + \dfrac{2}{3}x = \dfrac{1}{3}\)

\(\begin{array}{l}\dfrac{2}{3}x = \dfrac{1}{3} - 0,2\\\dfrac{2}{3}x = \dfrac{1}{3} - \dfrac{1}{5}\\\dfrac{2}{3}x = \dfrac{2}{{15}}\\x = \dfrac{2}{{15}}:\dfrac{2}{3}\\x = \dfrac{1}{5}\end{array}\)