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2-(-1)=

2+1=

3

When a parenthesis

is preceded by a minus sign,

remove

the parentheses

and

the minus sign before the parentheses

and

change the sign of each term

within the parentheses.

When a parenthesis (-1)

is preceded by a minus sign, -(-1)

remove

the parentheses ( )

and

the - sign before the parentheses

and

change the sign of each term -1

within the parentheses +1

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