I have a long equation in a TeX document and want to show help the reader to see clearly the transformations. On the other hand I do not want to repeat the equation for every little perhaps trivial step. Is there a common way to typeset a list of operations?
Minimal working example: Should I write \begin{align} 2x-4&=0 \quad | +4;\, :2\\ \Leftrightarrow \quad\quad\quad x&=2 \end{align}
or better
\begin{align} 2x-4&=0 \quad | +4\, |\, :2\\ \Leftrightarrow \quad\quad\quad x&=2 \end{align}
or something different? Is it obvious to read this from left to right?