Believe me - there are numerous solutions of the above alphametic.
I. What is the minimal possible sum of participating digits?
ii. Same question for as+df=gh
When I looked at this earlier I misread part 2 as adding the second condition to the part 1. The combined alphametic system still has multiple solutions, such as 162+743=905 and 16+27=43. I don't know how many total solutions exist.