From the figure below, the total deformation at the end of overhang is
The rotation θ at the left support is combination of Case No. 12 and by integration of Case No. 7.
Solving for θ
EIθ = EIθ due to 800 N·m moment at left support - EIθ due to 400 N/m uniform load
Apply Case No. 3 for solving δ1. From Case No. 3:
Solving for δ1:
Total deflection at the free end