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Question Number 69247 by Rio Michael last updated on 21/Sep/19
show that c∣a ⇔ −c∣a.
showthatc∣a⇔−c∣a.
Commented by kaivan.ahmadi last updated on 22/Sep/19
c∣a⇒a=cx; ∃x∈Z ⇒a=−c(−x) ⇒−c∣a
c∣a⇒a=cx;∃x∈Z⇒a=−c(−x)⇒−c∣a

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