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Addition is the inverse of subtraction in the following sense,

Addition is more basic and the usual approach is to define additive inverses (ie. negatives) and then define subtraction by using additive inverses, i.e. a subtract b means a + (-b) where

-b denotes that number such that b + (-b) = 0.

So, a subtract -3 means a + (- (-3) and -(-3) = 3 since -3 + 3 = 0.

Therefore, a subtract -3 is the same as a + 3 in all cases.

Subtracting -3 is the same as adding 3.

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Q: What is the inverse operation of subtract -3?
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