TeX Quellcode:

\begin{array}{crcrcrcrl} \text{I} & 2r &+& 2s &+& 3t &=& 7 \cr \text{II} & & & -4s &-& 4t &=& 5 \cr \text{III} & 4r &+& 8s &+& 10t &=& 6 \cr \cr \text{I} & 2r &+& 2s &+& 3t &=& 7 \cr \text{II} & & & -4s &-& 4t &=& 5 \cr \text{2I-III} & & & -4s &-& 4t &=& 8 \cr \cr \text{I} & 2r &+& 2s &+& 3t &=& 7 \cr \text{II} & & & 4s &+& 4t &=& 5 \cr \text{II-III'} & & & & & 0 &=& -3 \end{array}