TeX Quellcode:
\begin{array}{cclll} 2l &=& 2z-14 & \vert & :2 \cr l &=& z-7 \cr \cr 12b &=& 3l+ \dfrac{1}{3}z+11 & \vert & \text{Setze l ein} \cr 12b &=& 3(z-7)+\dfrac{1}{3}z+11 & \vert & \text{Setze z ein} \cr 12b &=& 3(-9-7)+ \dfrac{1}{3} \cdot (-9)+11 \cr 12b &=& 3 \cdot (-16)-3+11 \cr 12b &=& -48-3+11 \cr 12b &=& -40 & \vert & :12 \cr b &=& -\dfrac{40}{12} = - \dfrac{10} {3} \end{array}