[NTG-context] Align with comments

[David Arnold]

Aditya,

I think a while back you provided an align example with comments,  
such as:

2x+3=5              Add -3 to both sides
2x+3-3=5-3     Simplify
2x=2                   Divide both sides by 2

Etc.

Could you provide another sample of this for us?

Thanks.