TeX Quellcode:
\begin {array}{cclll} 2a &=& 18z+2 & \vert & :2 \cr a &=& 9z+1 \cr \cr x &=& a-10-4z & \vert & \text{Setze a ein} \cr x &=& 9z+1-10-4z & \vert & \text{Setze z ein} \cr x &=& 9 \cdot (-5)+1-10-4 \cdot (-5) \cr x &=& -45+1-10+20 \cr x &=& -44-10+20 \cr x &=& -34 \end {array}