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How to keep the space before + operator?

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Here there is the code to generate the example:

\documentclass[a4paper]{article}

\usepackage{mathtools}

\begin{document}

\begin{equation}
  \begin{multlined}
    a = b + c
  \end{multlined}
\end{equation}

\begin{equation}
  \begin{multlined}
    a = b + \\ + c
  \end{multlined}
\end{equation}

\end{document}
  • 4
    Add {} after the +: a = b +{} \\ + c – gernot Mar 26 '17 at 12:23
  • @gernot, do you intend to write answer? or we close the question as solved by comment? – Zarko Mar 26 '17 at 13:40
  • @Zarko I've found a duplicate, so let's close it. – gernot Mar 26 '17 at 13:48
  • I spent quite a lot of time trying to find the answer on my question. Maybe then it would be useful to make the formulation of the original question more general? – desa Mar 26 '17 at 15:39