Решите систему уравнений:

\(\displaystyle\begin{aligned}\begin{cases}4y-3x=52{\small,}\\(7+x)^2-(9-x)^2=-104y{\small.}\end{cases}\end{aligned}\)

\(\displaystyle x=\) [ ] \(\displaystyle ;\)\(\displaystyle y=\)  [ ]\(\displaystyle .\)