Question: Variable substitution within a procedure

The attached worksheet solves several equations and populates a spreadsheet; however, I have not been able to get all of the equations to evaluate numerically.  The misstep in the procedure CircumStrain () occurs immediately after fsolving Eq17 for L.  I would then like to calculate the numeric value of y_c using the numeric value of L.  I have not been successful in getting the expression to evaluate numerically.  Any suggestion or assistance is greatly appreciated.

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