TeX Quellcode:
\begin{array}{rclll} 2x - 4 \, &=& \, -4x - 1 & \vert & +4x+4 \cr 2x+4x &=& -1+4 \cr 6x &=& 3 & \vert & :6 \cr x &=& \dfrac{1}{2} \end{array}