Question: fsolve and initial values

fsolveLagrangeNumeri.mw

Dear Colleagues
As you can see from the worksheet with the command solve achieving results. I would like to enter initial values for b, a and R0. When trying to use fsolve for this purpose
I get the following result:
Error, (in fsolve/setrange) R0 = 10 is an invalid range

How to achieve convergence using fsolve?
any help?
Gracias

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