docs: def _solve(self, sense=None):
          """Remove old constraints and then solve the current problem.
  
          Args:
              sense: Minimize or maximize the objective.
                  (:class:`.lp.ObjectiveSense)
  
          Returns:
              The Result object for the solved LP problem
          """
          # Remove the constraints from the last run
          while len(self._remove_constr) > 0:
              self._remove_constr.pop().delete()
  
          try:
              return self._prob.solve(sense=sense)
          except lp.SolverError as e:
              raise_from(MOMAError(text_type(e)), e)
          finally:
              self._remove_constr = []