TeX Quellcode:

\begin{array}{rclcl} f_2(x_s) &=& f_3(x_s) \cr -7x_s-6 &=& \dfrac{27}{9}x_s+1 \cr -7x_s-6 &=& 3x_s+1 &\vert & +6 \cr -7x_s &=& 3x_s+7 &\vert & -3x_s \cr -10x_s &=& 7 &\vert & :(-10) \cr x_s &=& -\dfrac{7}{10}\end{array}