Question 1203026
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I see this problem more as a puzzle than a math problem.  It does
require some thought combined with trial-and-error:

If 2 is replaced by 6 you get:

     746586
    +869430
 ------------
    1616016      

Also note 1212016 becomes 1616016, as required.

Thus, you have d=2, e=6  so  d+e = 8.