Câu trả lời:
\(\left[\dfrac{4}{9}+\left(\dfrac{3}{8}x.\left(-\dfrac{1}{2}\right)\right)\right].\dfrac{6}{11}=\dfrac{18}{55}\)
\(\Rightarrow\)\(\left[\dfrac{4}{9}+\left(\dfrac{3}{8}x.\left(-\dfrac{1}{2}\right)\right)\right]=\dfrac{18}{55}:\dfrac{6}{11}\)
\(\Rightarrow\dfrac{4}{9}+\dfrac{3}{8}x.\dfrac{-1}{2}=\dfrac{3}{5}\)
\(\Rightarrow\dfrac{3}{8}x.\dfrac{-1}{2}=\dfrac{3}{5}-\dfrac{4}{9}\)
\(\Rightarrow\dfrac{3}{8}x.\dfrac{-1}{2}=\dfrac{7}{45}\)
\(\Rightarrow\dfrac{3}{8}x=\dfrac{7}{45}:\dfrac{-1}{2}\)
\(\Rightarrow\dfrac{3}{8}x=\dfrac{-14}{45}\)
\(\Rightarrow x=\dfrac{-112}{135}\)