TeX Quellcode:

\begin{array}{rclcl} f_1(x_s) &=& f_2(x_s) \cr 3x_s-6 &=& -7x_s-6 &\vert & +6 \cr 3x_s &=& -7x_s &\vert & +7x_s \cr 10x_s &=& 0 &\vert & :10 \cr x_s &=& 0\end{array}