Solve the following linear congruence 6x ≡15 (mod 21)

Elements Of Modern Algebra
8th Edition
ISBN:9781285463230
Author:Gilbert, Linda, Jimmie
Publisher:Gilbert, Linda, Jimmie
Chapter2: The Integers
Section2.7: Introduction To Coding Theory (optional)
Problem 11E: Show that the check digit in bank identification numbers satisfies the congruence equation .
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Solve the following linear congruence 6x ≡15 (mod 21)
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