Addition is a sum and so is subtraction. So there's your answer!
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Addition and subtraction can be thought of as the same thing because subtracting a negative number is the same as adding it and adding a negative number is the same as subtracting it.
No,, they do not. Why would anyone have two operations that are the same?
They are different in the same way that subtraction of integers is different from their addition.
Addition and subtraction are reverse operations.
Addition is the inverse operation to subtraction.