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OK, thank you very much, it's really useful

But, is there any trick to increment the equation counter automatically?

Hello,

I have some equations that I would like to show aligned. However, I want to gather them in two groups, so I can make a reference to the first group, or to the second group (a single equation in this case).

I would like to do the next, but with the last equation aligned to the previous 4 ...