TeX Quellcode:
\begin{array}{rclcl}x &=& \dfrac{x}{2}+\dfrac{x}{4}+\dfrac{x}{7}+3 & \vert& \text{erweitern} \cr x &=& \dfrac{14x}{28}+\dfrac{7x}{28}+\dfrac{4x}{28}+3 &\vert& \cdot 28 \cr 28x &=& 14x+7x+4x+84 \cr 28x &=& 25x+84 &\vert& -25x \cr 3x &=& 84 &\vert& \cdot \dfrac{1}{3} \cr x &=& 28 \end{array}