TeX Quellcode:

\begin{array}{rclll} \dfrac{x+3}{2} &=& \dfrac{x+3}{4}&\vert&\cdot4 \cr 2(x+3)&=&x+3 \cr 2x+6&=&x+3&\vert&-6-x \cr 2x-x&=&3-6 \cr x&=&-3\end{array}