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They are not necessary, but I don't really have a specific problem. It's more on how to do something, so It's not that something is interfering with something else.
I anyway added the tex without preamble, ERT and the other lyx file. The other lyx file had macros I used so that might explain ...

Thanks for the reply!
I attached the Lyx file, pdf output and source code.
I also tried to have a single right bracket span two lines which produces an error.
So the pdf is without it and the lyx has what I tried to make that happen.
I don't really know any Latex code either.

Thanks!

Hey,

I've been having trouble for a while making the attached equation look normal.
I've read about different align environments but couldn't get any of them to work well (since a bunch need actual code which i'm not familiar with)
The main problems with what I've done is that awkward minus sign ...