I'd like to have a **single equation without indentation** at all.

I know I can set it globally with

```
\setlength{\mathindent}{0cm}
```

But I don't know how to return to the default value after the equation.

Here my minimal example:

```
\documentclass[a4paper,12pt]{article}
\usepackage[fleqn]{amsmath}
\begin{document}
\noindent
Default indentation:
\begin{equation}
a+b=42
\end{equation}
%
Now I want no indention for a single equation:
\setlength{\mathindent}{0cm}
\begin{equation}
a+b=42
\end{equation}
%
Now I'd like to get the default again:
\begin{equation}
a+b=42
\end{equation}
%
But how?
\end{document}
```

## Best Answer