Question: Simplified form of equation/function

I am new user of Maple, couldn’t find solution for my problem in the last two days therefore I would like to turn to your community with my question. I am trying to replicate the calculations from a study to be sure about my understanding of the topic.

 

I cannot simplify the final equation even though the variables with their values are given. A screenshot and the file are attached, that might make easier to understand my problem.

I know what the solution should be. I cannot simplify/replace the values in the equation to get a simpler form; [(D0 - d1c - R)/ 2d1)]+c

 

Thank you if you have the time to help.

 

Joint_Pricing_Sol_.maple

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