Решите систему уравнений:
\(\displaystyle\begin{aligned}\begin{cases}7y-2x=39{\small,}\\(3+x)^2-(7-x)^2=-16y{\small.}\end{cases}\end{aligned}\)
\(\displaystyle x=\) [ ] \(\displaystyle ;\)\(\displaystyle y=\) [ ]\(\displaystyle .\)