Question: help to find minimum



i have a problem to find the minimum point for implictfunction ,

I have a implictfunction that is ( f(x,y,z)=0 ), i want to find the minimum point for x.

I try to solved this problem using optimastion package and lagrangeMulteplied. the poth packages do not solved the problem.

Also if i have a implicitfunction as g(x,y,z,k)=0.

can you help me to solved this problem using maple? 


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