\[y = \frac{x - 3}{1 - 2x}\]
\[(1 - 2x)y = x - 3\]
\[y - 2xy = x - 3\]
\[y + 3 = x + 2xy\]
\[y + 3 = x(1 + 2y)\]
\[x = \frac{y + 3}{2y + 1}.\]