[tex]\dfrac{x}{y} = \dfrac{2}{3}[/tex]
[tex]{\dfrac{2x}{2x+5y}}^{^{\displaystyle (y}} = \dfrac{2\cdot \frac{x}{y}}{2\cdot \frac{x}{y}+5} =\!{^{^{^{^{^{^{\displaystyle 3)}}}}}}}\!\!\dfrac{2\cdot \frac{2}{3}}{2\cdot \frac{2}{3}+5} = \dfrac{2\cdot 2}{2\cdot 2+3\cdot 5} = \dfrac{4}{19}[/tex]
