\[2x - \frac{x + 1}{3} = 3\ \ \ \ \ \ \ | \cdot 3\]
\[6x - (x + 1) = 9\]
\[6x - x - 1 = 9\]
\[5x = 9 + 1\]
\[5x = 10\]
\[x = 2.\]
\[Ответ:x = 2.\ \]