I am doing a proof homework that requires this special composition. The equation numbers need to come before the equation, i.e. on the left of the equation. It should look something like this:

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However, this was achieved rather hacky using tabto package and is not referenced (all numbers are typed in manually). Therefore, I was thinking if there is a way to put the equation number before the equations on the left in align environment (or other similar environment for equations), so I could get automatic and referable equation numbers.

Thank you!


That is the option leqno of your document class, if you use a standard one.

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