Answer :

Factor each nmber down to prime factors. If they have any factors in common, they can be simplified. 

15 is 5 times 3 

32 is 2 times 2 times 2 times 2 times 2 

No factors in common.

That is as simplified as it will get.

Sorry!
It is actually impossible, because 15 and 32 have no common factors.

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