\(\dfrac{-14}{42}-x=\dfrac{-3}{7}\)
\(\Rightarrow\dfrac{-7}{21}-x=\dfrac{-3}{7}\)
\(\Rightarrow\dfrac{-7}{21}-x=\dfrac{-9}{21}\)
\(\Rightarrow x=\dfrac{-7}{21}-\dfrac{-9}{21}\)
\(\Rightarrow x=\dfrac{2}{21}\)
\(\dfrac{-14}{42}-x=\dfrac{-3}{7}\)
\(x=\dfrac{-14}{42}-\dfrac{-3}{7}\)
\(x=\dfrac{-14}{42}-\dfrac{-18}{42}\)
\(x=\dfrac{2}{21}\)