1. Parentheses are preceded by a "+". Remove the brackets and the "+"in front of them, and the symbols of the items in brackets remain unchanged.

2. The minus sign comes before the brackets. Remove the brackets and the "-"sign in front of them, and change the symbol of each item in brackets.

﹙﹢5﹚-﹙﹢8﹚﹢﹙﹣2﹚-﹙﹣3﹚﹢﹙﹢7﹚

=5-8-2+3+7

Note: in -3-, because there is a-sign in front of the brackets,-3 becomes 3.