It is not a good idea to break mathematical insertions in text.
It happens in this example:
\documentclass{report}
\begin{document}
dfasfsd asdfsdafds asdfsdfds gdsds sfsdd ssfsd wwer sfdsf ggfh dh dgfdd $r=0.1$ sdfsd sdfdsf asgg sdfsdf a a sfsdf.
\end{document}
How to do our best to preserve mathematical insertions on one line? Is there anything more handy than manually wrapping the troubled place in mbox?

\sloppyand\relpenalty=10000in the preamble to avoid chasing down individual paragraphs? – Viesturs Apr 22 '19 at 16:31