the cases environment is provided by the amsmath package- the mathtools package introduces extensions of it (dcases, etc)

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hyperref + subequations warnings

This is a follow up question to How to hide known warnings? Recently I decide to stop ignoring LaTeX warnings :), and start trying to discover what's behind them and how to avoid them in future ...
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Problem with \begin{cases} -\end{cases}

I was reading some other questions about people getting problems with the environment cases and the solution was to install the package amsmath, which I did, but now I got this error message: 1.53 ...