The

distributive property would require an addition inside parentheses.

What is being applied here is a property that says that -(-a) = a. I don't know that this has a universal name; it might be called the "negative of a negative property", or something like that. Or, you might just have been given a property that says subtraction is addition of the negative (perhaps presented as a definition of subtraction: a - b = a + (-b). Possibly you are expected to mention both of these together.

Can you list the properties you have been taught?

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