Bending stress in a beam with overhang

Constructing the shear diagram

Considering the segment
from x = 6 m to x = 8.6 m

 area under shear
     diagram = +20.28 kN-m
 concentrated
   moments =     0.00 kN-m
 change in bending
     moment = +20.28 kN-m

    at x = 6 m,     M =   -14.40 kN-m
 change in bending
          moment    =   +20.28 kN-m
    at x = 8.6 m,  M =   +34.68 kN-m