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V = IR, I = V/R, and R = V/I is not a set of three equations: it is a
set of three representations of one equation.
found a lengthy explanation to help learn "the three equations" of Ohm's Law.
Apparently it is well established by experiment that in general forgetting
follows a fairly universal power law.
You look up data! (And numerical data changes over time.)
I don't ask my students to memorize physical constants, I teach
students where to find the data and how to assess the quality of the
data.