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The absolute value of a real number $a$, denoted by $|a|$, is the distance between $a$ and 0 on a number line. Therefore, $|a|=a$ if $a\geq0$, and $|a|=-(a)$ if $a\lt0$. Therefore, $|-8|+(-16)=-(-8)+(-16)=8+(-16)=-8$.
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