[tex]\displaystyle y\sqrt{2}+y \sqrt{3}=3 \\ \\
y\sqrt{3}+y \sqrt{2}=3\\ \\
y(\sqrt{3}+\sqrt{2})=3 \\ \\
y= \frac{3}{\sqrt{3}+\sqrt{2}} = \\ \\ \\
=\frac{3(\sqrt{3}-\sqrt{2})}{(\sqrt{3}+\sqrt{2})(\sqrt{3}-\sqrt{2})}= \\ \\ \\
=\frac{3(\sqrt{3}-\sqrt{2})}{(\sqrt{3})^2-(\sqrt{2})^2} = \frac{3(\sqrt{3}-\sqrt{2})}{3-2}=\boxed{3(\sqrt{3}-\sqrt{2})}[/tex]