TeX Quellcode:
\begin{array}{rclll}\dfrac{4x^2+2}{4x-1}+1 &=& 0 &\vert &\cdot \left(4x-1\right)\\4x^2+2+1\cdot(4x-1) &=& 0\\4x^2+4x+1 &=& 0 &\vert & :4\\x^2+x+\dfrac{1}{4} &=& 0 &\vert &\text{1. binomische Formel} \\\left(x+\dfrac{1}{2}\right)^2 &=& 0 &\vert &\sqrt{}\\x+\dfrac{1}{2} &=& 0 &\vert & -\dfrac{1}{2}\\x &=& -\dfrac{1}{2}\;\in\;\mathbb{D}\end{array}