\[\boxed{\text{970\ (970).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[7x + 8y = 30;\ \ x = y\]
\[7x + 8x = 30\]
\[15x = 30\]
\[x = 2 \Longrightarrow \text{\ \ }(2;2)\]
\[Ответ:(2;2).\]