code: def test_point_cflexure():
      E = Symbol("E")
      I = Symbol("I")
      b = Beam(10, E, I)
      b.apply_load(-4, 0, -1)
      b.apply_load(-46, 6, -1)
      b.apply_load(10, 2, -1)
      b.apply_load(20, 4, -1)
      b.apply_load(3, 6, 0)
      assert b.point_cflexure() == [Rational(10, 3)]
  
imports: from sympy.core.function import expand
  from sympy.core.numbers import Rational, pi
  from sympy.core.singleton import S
  from sympy.core.symbol import Symbol, symbols
  from sympy.sets.sets import Interval
  from sympy.simplify.simplify import simplify
  from sympy.physics.continuum_mechanics.beam import Beam
  from sympy.functions import SingularityFunction, Piecewise, meijerg, Abs, log
  from sympy.testing.pytest import raises
  from sympy.physics.units import meter, newton, kilo, giga, milli
  from sympy.physics.continuum_mechanics.beam import Beam3D
  from sympy.geometry import Circle, Polygon, Point2D, Triangle
  from sympy.core.sympify import sympify
label_desc: Use image node_id 7 for calling a global function with example usage: test_point_cflexure() without return types