Question: Can't solve systems of equations

Hello friends;

I want to solve 3 - second orger equations with  6 unkowns. 

When i say just dsolve without boundry conditions it is solving but so complicated. 

_C6Ci  it is giving like that which i dont know the meaning of Ci.

But with boundry conditions it is not solving .

May you help me please where i am doing wrong. I downloaded the file.

Thanks.

Curvedbeam_static_variablethickness_analitik4.mw

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