Yes, very. What goal are you trying to achieve?
If I understand you correctly, all the numbers in the D column are calculated totals derived from A and B column. Therefore, users won't be entering anything in D column.
Just to make sure I totally understand what you are doing:
1. Users enter some numbers in column A and some numbers in column B.
2. The numbers in coumn A are summed in cell A6. Likewise with the numbers in column B.
3. Column D you are using as some sort of cross check. The sum of A1:B1 is calculated and placed in D1. All numbers in column D are summed and the total is placed in D9. You want to validate that the sum in D9 is equal to the sum of A6:B6.
Is this all essentially correct? Are there numbers other than user input included in the totals (A6, B6, D9).
In another cell of your choosing, you can always place an IF statement to verify that the D9=A6+B6 and display a message if they do not match. However, assuming users are only entering numbers in columns A and B and no other numbers are included in the sums mentioned, then the sums will always match.
Or am I missing something here?