So this is what I'm thinking.
When a point is scaled at 65% and you want that point to equal 100% the equation is this:
Now how do I script that?
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I'm not sure I understand you. The inverse simply is 1/x, you only need to multiply, but based on the source size, not the already scaled value, so in essence it's 1/x*1. In your case the part you could be missing missing is probably the difference, 1-y, which you may require to compensate for the value offset to start your calculations based on 100%.
I believe your math is correct. The only thing that remains is how I would write that in the code:
This is all academic now because I decided since it was one shot I'd scale by hand (sigh) but it's something I would revisit regularly if the process could be viable.