I'm starting to write in Latex in a more professional way and I'm facing with the following problem:
I want to display this long equation in the more easy reading way:
So I think the best possibilities is the following:
So what's the best way to display this multiple equation? Is there any book which has tips how to display multiple equations in a more easy reading elegant way?
Remark: This question is not about the environments (multline, align, etc.) themselves. Since Latex writers have to deal with this kind of problem quite frequently, maybe some of you have some tips or sources to share.