TeX Quellcode:
\begin{array}{cclll} 2s &=& -4r-t+12 & \vert & \text{Setze r ein} \cr 2s &=& -4(3t-16)-t+12 & \vert & \text {Setze t ein} \cr 2s &=& -4(3 \cdot 24-16)-24+12 \cr 2s &=& -4 \cdot 56-24+12 \cr 2s &=& -224 -24+12 \cr 2s &=& -236 & \vert & :2 \cr s &=& -118 \end{array}