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8+|-7|
The absolute value of a real number a is a when a\geq 0, or -a when a<0. The absolute value of -8 is 8.
8+7
The absolute value of a real number a is a when a\geq 0, or -a when a<0. The absolute value of -7 is 7.
15
Add 8 and 7 to get 15.