Translate the following inference to logic notation: For all x, x_7 will make tea if and only if x_7 will take a plane. For all x, if x_7 makes tea, then x_7 is taking a plane. Therefore if Richard makes tea, then Richard is taking a plane.
forall x: P(x) <-> Q(x). forall x: P(x) -> Q(x). Therefore P(a) -> Q(a).