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-23+29-|-21|
The opposite of -29 is 29.
6-|-21|
Add -23 and 29 to get 6.
6-21
The absolute value of a real number a is a when a\geq 0, or -a when a<0. The absolute value of -21 is 21.
-15
Subtract 21 from 6 to get -15.