5/3
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-5
The inverse operation for subtract 5 is add 5. This is because whatever number you start with, if you first "subtract 5" and then "add 5" or if you first "add 5" and then "subtract 5" you are back to the number you started with.
What is exercise 5 that would be easier
find the inverse of (1,-5)(3,-3)(4,-2)
No, it is not. 3/5 is rational and its multiplicative inverse is 5/3 which is not an integer.