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parenthesis ( )square brackets [ ]curly brackets { }
Brackets.
Brackets are basically the same as parentheses. If they are inside of parentheses, then you simplify that term before anything else. If they are outside of parentheses, then you simplify the terms in the parentheses first and then the term within the brackets.
2m
(x - 6) (x + 4) = x2 - 2x - 24