(Abbreviation: the same symbol is positive and different symbols are negative)
+(-2) is positive and negative. If you select 2, you will get -2 before putting the minus sign.
-(+ 1/3) is negative and positive. If you extract 1/3, you will get-1/3 before putting the minus sign.
-(-2.5) is negative and positive. If you select 2.5, you will get +2.5 before putting the plus sign.
+(+3. 14) means that what is correct is correct. If you select 3. 14, you will get +3. 14 before putting the plus sign.
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