[tex]Bonjour\\\\\\ \dfrac{2}{27}+\dfrac{28}{27}\times \dfrac{-9}{14} =\dfrac{2}{27}+\dfrac{28}{14}\times \dfrac{-9}{27} =\dfrac{2}{27}-2\times \dfrac{1}{3}\\\\\\=\dfrac{2}{27}-\dfrac{2}{3}=\dfrac{2}{27}-\dfrac{18}{27}=\dfrac{2-18}{27}=\dfrac{-16}{27}=-\dfrac{16}{27}\ .[/tex]