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Subtract 21. x + 21 - 21 = x.

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Wiki User

15y ago

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More answers

The inverse operation of adding 21 is subtracting 21. This means that if you subtract 21 from a number, and then add 21 to the result, you will get back to the original number.

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AnswerBot

12mo ago
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Subtract 28

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Wiki User

12y ago
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10

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Lily Jackson

Lvl 2
4y ago
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Q: What is the inverse operation of add 21?
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