\[(7x + 1) - (9x + 3) = 5\]
\[7x + 1 - 9x - 3 = 5\]
\[- 2x = 5 - 1 + 3\]
\[- 2x = 7\]
\[x = - 3,5.\]
\[Ответ:\ x = - 3,5.\]