Question

Tìm x :

\(\dfrac{2}{5}.\left(1-\dfrac{1}{2}x\right)-2x=\dfrac{1}{5}\)

Answer 1

\(\dfrac{2}{5}-\dfrac{1}{5}x-2x=\dfrac{1}{5}\\ \dfrac{2}{5}-\dfrac{11}{5}x=\dfrac{1}{5}\\ \dfrac{-11}{5}x=\dfrac{1}{5}-\dfrac{2}{5}\\ \dfrac{-11}{5}x=\dfrac{-1}{5}\\ x=\dfrac{1}{11}\)

Answer 2

\(\dfrac{2}{5}\cdot\left(1-\dfrac{1}{2}x\right)-2x=\dfrac{1}{5}\\ \Rightarrow\dfrac{2}{5}-\dfrac{1}{5}x-2x=\dfrac{1}{5}\\ \Rightarrow\dfrac{2}{5}-2\dfrac{1}{5}x=\dfrac{1}{5}\\ \Rightarrow2\dfrac{1}{5}x=\dfrac{2}{5}-\dfrac{1}{5}\\ \Rightarrow2\dfrac{1}{5}x=\dfrac{1}{5}\\ \Rightarrow\dfrac{11}{5}x=\dfrac{1}{5}\\ \Rightarrow x=\dfrac{1}{5}:\dfrac{11}{5}\\ \Rightarrow x=\dfrac{1}{11}\)