Alignment across elements

[fathom quarry]

what is the actual usecase for this

i dont know if there is a general way to deal with the problem

[spiral niche]

You can use place to put braces next to the equation

[willow tartan]

I have three equations, and two of them have already been sort of introduced

I want to put an "as seen in section xy" next to the brace

[willow tartan]

yes, that seems to be the only way