This week I worked on solving statically indeterminate beam systems and created #14826 for that. Some work was already done in #14681, which me and Jason reviewed during community bonding period.

Now Beam class uses boundary conditions (bc_deflection and bc_slope) to solve for unknown reactions, hence making statically indeterminate systems solvable.

```
>>> from sympy.physics.continuum_mechanics.beam import Beam
>>> from sympy import symbols
>>> E, I = symbols('E, I')
>>> F = Symbol('F')
>>> l = Symbol('l', positive=True)
>>> b5 = Beam(l, E, I)
>>> b5.bc_deflection = [(0, 0),(l, 0)]
>>> b5.bc_slope = [(0, 0),(l, 0)]
>>> R1, R2, M1, M2 = symbols('R1, R2, M1, M2')
>>> b5.apply_load(R1, 0, -1)
>>> b5.apply_load(M1, 0, -2)
>>> b5.apply_load(R2, l, -1)
>>> b5.apply_load(M2, l, -2)
>>> b5.apply_load(-F, l/2, -1)
>>> b5.solve_for_reaction_loads(R1, R2, M1, M2)
>>> b5.reaction_loads
{R1: F/2, R2: F/2, M1: -F*l/8, M2: F*l/8}
```

**Next Week**

**Next Week**

- Add max_bmoment and mx_shear_force methods to #14826.

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