Translate the following inference to logic notation: For all x, if x_5 were a politician, then x_5 is sad. For all x, x_5 is not sad. For all x, x_5 is a politician or x_5 will not take a plane. Therefore for all x, x_5 will not take a plane.
forall x: P(x) -> Q(x). forall x: ~Q(x). forall x: P(x) or ~R(x). Therefore forall x: ~R(x).