What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: For all x_5, if x_5 were rich, then x_5 is working. For all x_5, x_5 is rich. For all x_5, if x_5 were a politician, then x_5 is excited. For all x_5, if x_5 were a mechanic, then x_5 is excited. For all x_5, x_5 is a politician or x_5 is a mechanic.
For all x_5, x_5 will work can be inferred via the universal modus ponens rule. For all x_5, x_5 is excited can be inferred via the universal disjunction elimination rule.