\[\frac{2x - 1}{6 - 3x} + \frac{2x + 1}{2x - 4} - \frac{x + 3}{6x - 12} =\]
\[= \frac{- 4x + 2 + 6x + 3 - x - 3}{6 \cdot (x - 2)} =\]
\[= \frac{x + 2}{6 \cdot (x - 2)}\]