Đáp án:
\(x=2\)
Giải thích các bước giải:
$\begin{array}{l}
\left( {0,5.x - \dfrac{3}{7}} \right):\dfrac{1}{2} = 1\dfrac{1}{7}\\
\left( {\dfrac{1}{2}.x - \dfrac{3}{7}} \right):\dfrac{1}{2} = \dfrac{8}{7}\\
\dfrac{1}{2}.x - \dfrac{3}{7} = \dfrac{8}{7}.\dfrac{1}{2}\\
\dfrac{1}{2}.x - \dfrac{3}{7} = \dfrac{4}{7}\\
\dfrac{1}{2}.x = \dfrac{4}{7} + \dfrac{3}{7}\\
\dfrac{1}{2}.x = 1\\
x = 1:\dfrac{1}{2}\\
x = 2
\end{array}$
