\(\left|x-y\right|+\left|y+\frac{9}{25}\right|=0\)
Vì \(\left\{{}\begin{matrix}\left|x-y\right|\ge0\\\left|y+\frac{9}{25}\right|\ge0\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x-y=0\\y+\frac{9}{25}=0\end{matrix}\right.\Leftrightarrow x=y=-\frac{9}{25}\)