Researching, I found that the Wheatstone bridge it's the most common mode for obtaining a change of voltage due to a change of resistance. After a few elementary maths I've reached the resistance vs voltage equation. If I didn't make any mistakes, then the picture shows this plot. If I did have mistakes, then I will apologise (again) and re-do the job. Of course, being the plot positive or negative is just a matter of how the voltage is being measured.
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