Consider the congruence a² + x + 1 = 0 mod 21. Solutions to the congruence above must also be solutions to 2² + x + 1 mod (separate answers with a comma) Given the solution above, we know that all solutions to a² + x + 1 = 0 mod 21. will have the form F or mod 3 (separate answers with a comma) Solving the above system, we find that a complete solution to a² + +1 0 mod 21 is a (give least residues and separate answers with a comma) mod 7

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