(Adapted from Richardson problem Solve the congruence 589z = 494 (mod 817). Hint: The solution should be erpressed as a congruence modulo something other than 817.

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A: 1-19601-73-10-844-4300R3  →R3+ R1,   R4 → R4 - 4 R11-19601-730-111000-6-24

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