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How to introduce a Functional with the results with Solve command?


I get the expression of urm which is a function of rom. 
 
sol3=Solve[sol2 == 0, urm]; 
sol4[rom_] = sol3[[1]][[1]][[2]];
Because rom is a function of x1, I want to take the derivative of the following functional with respect of x1. 
sol5[x1_]=3*rom -sol4[rom]
How should I do it?
If convenient, please send an email to
kaibinfu at gmail.com
thanks.


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