I have problems to raise the equations. They could recommend me a text to be able to solve it.
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Assuming that the bearing can be modelled (as it should) as hinges, then you have
The procedure goes as follows.
a) Take out the bearings (hinges) and replace them with their vertical reactions (no moments): the system is statically determined, so apply equilibrium of forces and moments to get the reactions.
b) Take a cross-section cut at $x$; replace with the internal force $T(x)$ and moment $M(x)$; in this case we have no axial tension $N(x)$; use signs as appropriate with the reference system adopted, which shall always be indicated.
c) Consider (as conventionally done) the left part ($0$ to $x$); add the external forces and reactions and equilibrate like before.
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$\begingroup$ Excuse me you could explain a little more; For example, first point I have to verify the static conditioning ie the sum of forces in the axes must be zero and also, the conditioning of the moment, then, I determine the reactions, right? And then, as I do the diagrams, can you explain me a little more? $\endgroup$– Santiago SeekerCommented Oct 25, 2018 at 1:12
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$\begingroup$ @SantiagoSeeker: I expanded my answer a little more, wish it is sufficient. $\endgroup$– G CabCommented Oct 25, 2018 at 11:34