TeX Quellcode:

\begin{array}{rclll}196-4x^2 &\neq & 0 &\vert & +4x^2\\4x^2 &\neq & 196 &\vert & :4\\x^2 &\neq & 49 &\vert &\pm\sqrt{}\\x &\neq & \pm 7 \end{array}