\(4-x=2\dfrac{3}{8}\)
\(4-x=\dfrac{19}{8}\)
\(x=4-\dfrac{19}{8}\)
\(x=\dfrac{32}{8}-\dfrac{19}{8}\)
\(x=\dfrac{13}{8}\)
\(4-x=2\dfrac{3}{8}\\ \Rightarrow4-x=\dfrac{19}{8}\\ \Rightarrow\dfrac{32}{8}-x=\dfrac{19}{8}\\ \Rightarrow x=\dfrac{32}{8}-\dfrac{19}{8}\\ \Rightarrow x=\dfrac{13}{8}\)