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    Welcome to TeX.SX! Did you try adding \usepackage{microtype}? Commented Oct 21, 2018 at 21:10
  • you don't give any example which makes it hard to answer. It appears that you are using inline math? normally such a large expression would be set as display mat (which may already be enough to make it less wide) Commented Oct 21, 2018 at 21:30
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    you can reduce \thicmuskip and \medmuskip to reduce math space, but without any example code hard to give any specific advice Commented Oct 21, 2018 at 22:34
  • Is there a convenient way to implement reductions in \thicmuskip and \medmuskip to apply to just one math environment rather than the whole document? Commented Oct 22, 2018 at 0:35
  • they are local settings so any normal tex grouping will restrict the scope. {...} or \begin{something}...\end{something} or if grouping isn't appropriate just set them before the equation and set them back afterwards Commented Oct 22, 2018 at 10:52