I'd like to obtain something like,
A + B = C + D => A + B + E = C + D + E => A + E = C + D + E - B = C + F - B = G - B => A + E + B = G
I've tried fiddling with align and alignat, but couldn't get what I want. The only way that I could think of is to use explicit value for horizontal space, which is very messy. Another solution is to use phantom, but again that seems cumbersome.
Any help regarding this is appreciated!