TeX Quellcode:
\begin{array}{rclcl}\ln(x) &=& -\ln(4x) &\vert& +\ln(4x) \cr \ln(x)+\ln(4x) &=& 0 &\vert& \text{1. Logarithmengesetz} \cr \ln\left(4x^2\right) &=& 0 &\vert& e^{*} \cr 4x^2 &=& 1 \cr& ... & \cr x_1 &=& \dfrac{1}{2} \cr x_2 &=& -\dfrac{1}{2}\end{array}