Section D.2 From Section 6.3 - Critical points and extrema
You can use solver to solve a system of equations. You need to set the problem up with the set of input variables and the equation of the system 6.3.3. Then you call Solver and use all but one of the fromulas as constraints on the system 6.3.4. You can see a screencast of the example 6.3.2.
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