\(\Leftrightarrow\dfrac{2}{3}x=0,5-\dfrac{7}{12}\Leftrightarrow x=-\dfrac{1}{2}:\dfrac{2}{3}\Leftrightarrow x=-\dfrac{3}{4}\)
\(\dfrac{1}{2}-\dfrac{2}{3}x=\dfrac{7}{12}\\ \dfrac{2}{3}x=\dfrac{13}{12}\\ x=\dfrac{39}{24}\)
\(0,5-\dfrac{2}{3}x=\dfrac{7}{12}\)
\(\dfrac{1}{2}-\dfrac{2}{3}x=\dfrac{7}{12}\)
\(\dfrac{2}{3}x=\dfrac{1}{2}-\dfrac{7}{12}\)
\(\dfrac{2}{3}x=-\dfrac{1}{12}\)
\(x=\dfrac{-1}{8}\)
\(0,5-\dfrac{2}{3}x=\dfrac{7}{12}\)
\(-\dfrac{2}{3}x=0,5-\dfrac{7}{12}\)
\(\dfrac{2}{3}x=\dfrac{-1}{12}\)
\(x=\dfrac{-1}{12}:\dfrac{2}{3}\)
\(x=\dfrac{-1}{8}\)
Đề bài \(\Rightarrow\dfrac{1}{2}-\dfrac{2}{3}x=\dfrac{7}{12}\Rightarrow\dfrac{1}{2}-\dfrac{7}{12}=\dfrac{2}{3}x\Rightarrow\dfrac{-1}{12}=\dfrac{2}{3}x\Rightarrow x=\dfrac{-1}{12}:\dfrac{2}{3}=-\dfrac{1}{8}\)
Ta có: \(\dfrac{1}{2}-\dfrac{2}{3}x=\dfrac{7}{12}\)
\(\Leftrightarrow\dfrac{2}{3}x=\dfrac{1}{2}-\dfrac{7}{12}=-\dfrac{1}{12}\)
\(\Leftrightarrow x=\dfrac{-1}{12}:\dfrac{2}{3}=\dfrac{-1}{12}\cdot\dfrac{3}{2}=\dfrac{-3}{24}=\dfrac{-1}{8}\)