I have an equation that I want to look something like
a = b = c = 1/n[a_1 + a_2 + a_3 + ... + a_n]
That is, I'd like the = signs to be aligned, and I'd like to align the a_ns as well. I suspect that the alignat environment is what I'd want to use here. What's throwing me off is that there's just blank space before each a_i, so there's not the "grid alignment" present here that alignat and align are built for. I'd really appreciate any help, and I hope my question is clear. Thanks very much.