TeX Quellcode:

\begin{array}{rclll}\dfrac{2x+6}{\left(x^2-3\right)^4} &=& 0 &\vert& \cdot \left(x^2-3\right)^4 \cr 2x+6 &=& 0 &\vert& -6 \cr 2x &=& -6 &\vert& :2 \cr x &=& -3 \in\mathbb{D} \end{array}