Question

Prove or disprove: If 2x ≡ 6 mod10, then x ≡ 3 mod10.

Prove or disprove:

If 2x ≡ 6 mod10, then x ≡ 3 mod10.

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Answer #1

disprove because

inverse of 2 in (mod 10) does not exist

alternate  

otherwise this theorem contradictive

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