TeX Quellcode:

\begin{array}{rclll} 4 \, (4a-1) &=& 8 \, \left(\dfrac{1}{2}+2a\right) \cr 16a-4 &=& 4+16a & \vert & - 16a+4 \cr 16a-16a &=& 4+4 \cr 0 &=& 8 \cr \cr \mathbb{L} &=& \emptyset \end{array}