TeX Quellcode:

\begin{array}{crcrcrcrcl} \text{II} & a &+& b &-& 16 &=& -10 &\vert& +16 \cr \text{III} & 9a &+& 3b &-& 16 &=& 14 &\vert& +16 \cr \cr \text{II} & a &+& b & & &=& 6 \cr \text{III} & 9a &+& 3b & & &=& 30 \end{array}