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When you're numbering equations steps with align is it possible to separate the problem numbering like (problem #).(step) like they did here? example

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  • How is your problem environment defined? – Werner Nov 27 '18 at 3:58
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Straight from the amsmath documentation (PDF):

enter image description here

\documentclass{article}
\usepackage{amsmath}{document}

\begin{subequations}
  \renewcommand{\theequation}{\theparentequation.\arabic{equation}}
  \begin{align}
    a &= b \\
    c &= d
  \end{align}
\end{subequations}

\end{document}

enter image description here

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