You seem to be making good progress. (Why did you miss out the first R line? I don't suppose it will make a huge difference to your regression analysis, but you ought to include it. And P8 is 2703, not 2705.)
Combining equations 8 and 16, and writing Y for (μ/μ*)1/2, which is known, we have
ν0 = νe - 2νexe
ν0* = νeY - 2νexeY2
so you have 2 simultaneous linear equations for 2 unknowns.