\[\left\{ \begin{matrix} 7x + 3y = 43 \\ 4x - 3y = 67 \\ \end{matrix} \right.\ ( + )\]
\[11x = 110\]
\[x = 10.\]
\[3y = 43 - 7x = 43 - 70 = 27\]
\[y = 9.\]
\[Ответ:(10;9).\]