Forces in structure

See attachment for question and diagrams.
This problem is concerned with using the stiffness matrix method to find displacements and force in a structure. My problem is pre-eliminating the members. i have attached 2 diagrams. i would like help in trying to get from the first diagram, to the second diagram ( with eliminated members and forces calculated)

I know that


However, the UDL and other factors are causing me problems.
I don’t know where to start with this


Attached Images
File Type: png SS.png (52.7 KB)

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