Don't just answer but explain how to do it please

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asked Nov 22, 2018 222k views

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Ermin Dedovic · Answer 1 · 2018-11-28T17:20:05+0000

12 - absolute value of -21 so with those two vertical lines it means it wants the absolute value of them which means that number but positive so AV of 12 - AV of -21 which basically means 12-21 which is -9

Don't just answer but explain how to do it please

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