\[(8x - 3)(2x + 1) = (4x - 1)^{2}\]
\[2x + 8x = 3 + 1\ \ \ \ \ \ \ \ \ \ \ \ \ \]
\[10x = 4\ \ \ \ \ \ \ \ \ \ \ \]
\[x = 0,4\]
\[Ответ:0,4.\]