\(y+\dfrac{1}{6}=\dfrac{11}{12}\\ y=\dfrac{11}{12}-\dfrac{1}{6}\\ y=\dfrac{11-2}{12}\\ y=\dfrac{3}{4}\)
\(y+\dfrac{3}{8}\times\dfrac{4}{9}=\dfrac{11}{12}\)
\(y+\dfrac{1}{6}=\dfrac{11}{12}\)
\(y=\dfrac{11}{12}-\dfrac{1}{6}\)
\(y=\dfrac{11}{12}-\dfrac{2}{12}\)
\(y=\dfrac{9}{12}\)

4 và 5