What does the following code means in ARFoundation samples?

Some code in ARFoundation which contains maths not understandable.

Code (CSharp):

1.  
2. if (slider != null)
3.             scale = slider.value * (max - min) + min;
4. //What does the above expression means specially (max-min)+ min
5.  
6. void OnEnable()
7.     {
8.         if (slider != null)
9.             slider.value = (scale - min) / (max - min);
10. //The above expression meaning.
11.         UpdateText();
12.     }
13.  

I have commented the section which I dont understand
Why is the expression given on OnEnable()?

 

Hello,

I think it's just a normalisation because the minimum is not 0.

Best,
Alexis