Fill in the Blank

A retail manager is reconciling a cash register that started with a balance of 21. After a payout of 13 is recorded as a subtraction (2113{}21 - 13), the manager verifies the entry using the subtraction property, which states that subtracting a number is the same as adding its opposite. To rewrite the expression using this property, complete the equivalent addition expression: 21+{}21 + ____.

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Updated 2026-05-22

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