Shear force and bending moment diagrams question

1. The problem statement, all variables and given/known data
So in my notes we have the following example:

So I decided to try to solve it another way, this time I flipped the figure and here is my attempt:

I got the correct moment but then the signs on my shear is flipped. Does anyone know why?

http://ift.tt/1mV0SAx

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