1. The problem statement, all variables and given/known data In the question (see attached images), it asks me to draw the shear and moment diagrams for the beam shown in the figure. To do this, we use the equilibrium equations. What I do not understand is why M is present in the equilibrium equation for bending. Isn't the pivot point at M? If not, where is it? All three of the moments that can cause bending are present in their equation... 2. Relevant equations N/A 3. The attempt at a solution I think that one of the moments should be omitted. However, I am likely wrong as both a textbook and my Prof have all 3 moments in there. I would greatly appreciate an explanation of the proper logic. Thanks.