0
You don't. Addition is transitive (as is multiplication) and so you do not need to calculate brackets first as long as the sum has only additions (or only multiplications).
But what is 5 - 3 - 2
(5 - 3) - 2 = 2 - 2 = 0
or
5 - (3 - 2) = 5 - 1 = 4
So, in the case of subtraction, it is important to know which operator is done first. Brackets indicate the intended order when there is ambiguity.
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