Question 81599
Try to arrange a bet with your friend because you are correct.  Your friend is in error.
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When you have a term inside absolute value signs, it always becomes positive when you take
it outside of the absolute value signs.
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Examples:
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{{{abs(-12) = + 12}}}
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{{{abs(12) = 12}}}
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{{{abs(-24) = 24}}}
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{{{abs(24) = 24}}}
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Hope this helps your friend.  You don't need help. Congratulations and good work!