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Prove that the congruences x-a mod n and x b mod m admit a simultaneous solution if and only if (n, m) | (a -b). Moreover, if

I have first part of question good. Need to prove unique modulo and do not know where to start.

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a. h, m med mo) then th ven on given Gngrunces e modulo m sofution med mo

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I have first part of question good. Need to prove unique modulo and do not know where to start. Prove that the congruences x-a mod n and x b mod m admit a simultaneous solution if and only if (n, m)...
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