TeX Quellcode:

\begin{array}{rclcl} -20x^2 &=& 4x^4+29 &\vert& +20x^2 \cr 0 &=& 4x^4+20x^2+29 \cr 0 &=& 4\left(x^2\right)^2+20x^2+29\end{array}