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Hosni gave the following argument that -(a + b) = -a + -b, for all integers a and b. If the argument is correct, supply the missing reasons. If it is incorrect, explain why not.

- (a + b) = (-1) (a + b)
= (-1) a + (-1) b
= -a + -b

I would put () around -b, to read +(-b).

the operation +- is not defined.

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