Respuesta :

Because it's taking the absolute value, negatives become positive. You can rephrase it as 19-17, and you can do that one. Say it with me now, 2.
altavistard

The absolute value of -19, expressed as |-19|, is +19.  That of |+17| is 17.  We are thus left with +19 - 17, or 2.

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