LaTeX Length \mathsurround — Adjust the extra spacing between inline math environment and text

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\documentclass{article}
\usepackage{lipsum}
\usepackage{amsmath}

\begin{document}

\lipsum[1][1-2] $a=b+c$ (default extra spacing, 0pt)

\setlength{\mathsurround}{30pt}
\lipsum[1][1-2] $a=b+c$ (adjusted as 10pt)

\end{document}