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Answers for “视频如何验证 $2 \equiv -3 \pmod{5}$ 是有效的？”

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Because adding the modulus 12 to -2 gives 10 ( $-2 + 12 = 10$ ). This means -2 and 10 represent the same residue class modulo 12.

Conditions: Work modulo 12.; Allow negative representatives.