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    MHB Linear conqruence and relations problem

    thank you:D and sorry
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    MHB Linear conqruence and relations problem

    Suppose that the relation R is defined on the set Z where aRb means a = ±b. Establish whether R is an equivalence relation giving your justifications. Find the set of solutions of each of the linear congruence: a) x ≡ 3 (mod 5). b) 2x ≡ 5 (mod 9).(please write the full solutions thanks)