Error, (in solve) cannot solve for an unknown function with other operations in its arguments

Question:Error, (in solve) cannot solve for an unknown function with other operations in its arguments

Posted: Zeineb 520 Product: Maple

April 02 2019

I would like to solve the non-linear system to obtain rho1 and rho2 .

But when i use solve i get the following error
Error, (in solve) cannot solve for an unknown function with other operations in its arguments

many thanks

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