put the bracket before the answer and multiply it by the nth term
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Multiply out all the brackets (parentheses) and then combine like terms.
BOMDAS Brackets (parenthesis), Of, Multiplication, Division, Addition, Subtraction
You cannot usually simplify numbers. What you can simplify is numeric or algebraic expressions. You carry out the various operations but use BODMAS (I prefer BIDMAS) to determine the order. First do the Brackets. Next the Index (or power Of) Then, with equal priority, Division and Multiplication And last, again with equal priority, Addition and Subtraction.
By long division. Factorisation may work but you cannot depend on that.