Question: Affine cryptosystem is idempotent. Alice encrypted a message using the key K1 = (3, 6) and then encrypted it again using the key K2 =

Affine cryptosystem is idempotent. Alice encrypted a message using the key K1 = (3, 6) and then encrypted it again using the key K2 = (15, 10). Find the key K = (a, b) such that eK(x) = eK2 (eK1 (x)).

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