Question: Solving set of equations

Hi All,

I am trying to solve set of equations after applying boundary conditions.  There are 4 coefficients which I have to find by solving following 4 equations;

I tried to solve using the command solve({A, B,C,D},[E,F,G,H]), but it just returns [],  does anyone know which command to use for backward substitution of coefficients.  Also if I try to solve it separately, it says "recursive error"

Your help will be appreciated



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