\(\left(\dfrac{1}{7}-\dfrac{1}{3}\right)x=\left(\dfrac{-3}{2}\right)^2\Leftrightarrow\dfrac{-4}{21}x=\dfrac{9}{4}\Leftrightarrow x=\dfrac{\dfrac{9}{4}}{\dfrac{-4}{21}}=\dfrac{-189}{16}\)
vậy \(x=\dfrac{-189}{16}\)
\(\left(\dfrac{1}{7}-\dfrac{1}{3}\right)x=\left(\dfrac{-3}{2}\right)^2\)
\(\Rightarrow\dfrac{-4}{21}x=\dfrac{9}{4}\)
\(\Rightarrow x=\dfrac{9}{4}\cdot\dfrac{21}{-4}\)
\(\Rightarrow x=\dfrac{-189}{16}\)