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Thanks to all!
I hope I have solved this problem (6 parameters - 4 equations)
https://community.ptc.com/t5/PTC-Mathcad/Minimize-6-variables-and-4-equations/m-p/606542
6 parameters - 6 equations: all OK!
6 parameters - 4 equations: not all OK!
9 parameters - 5 equations: not all OK 😞
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