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Question: this is a discrete math question where you have to...

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This is a discrete math question where you have to prove the following, I was wondering what the proof for these would be. Its university level maths. 

SHOW THAT FOR ALL INTEGERS n THAT:

a) If d is an integer such that d | n+9, and d | n^2 + 5, then d | 86

b) If n is a multiple of 86, then n+9 and n^2+5 are coprime

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