Example 7. Given $y=5 \sqrt{3 \bar{x}-1}+2 \sqrt{1-3 \mathbf{x}}+\frac{1}{2}$, find the value of $\frac{\sqrt{y}}{\sqrt{x}-\sqrt{y}}+\frac{\sqrt{y}}{\sqrt{x}+\sqrt{y}}$,
Solving, we get $x=\frac{1}{3}$,
From this, $y=\frac{1}{2}$,
$$
\begin{array}{l}
\text { Hence } \frac{\sqrt{y}}{\sqrt{x}-\sqrt{y}}+\frac{\sqrt{y}}{\sqrt{x}+\sqrt{y}} \\
=\frac{\sqrt{y}(\sqrt{x}+\sqrt{y})}{x-y}+\frac{\sqrt{y}(\sqrt{x}-\sqrt{y})}{x-y} \\
=\frac{2 \sqrt{x y}}{x-y}=-2 \sqrt{x-} . \\
\end{array}
$$