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Let x and y be integers. Show that 9x+5y is divisible by 19 if and only if x+9y is divisible by 19. Thanks in advance.

 Aug 7, 2020
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See https://web2.0calc.com/questions/an-answer-was-originally-written-as-a-photo-is-there#r4

 Aug 8, 2020

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