Translate the following inference to logic notation: For all x, if x_7 drinks water, then x_7 is listening to a song. For all x, x_7 will listen to a song. For all x, if x_7 listens to a song, then x_7 is drinking water. For all x, if x_7 were a taxi driver, then x_7 is drinking water. Therefore for all x, x_7 will drink water.
forall x: P(x) -> Q(x). forall x: Q(x). forall x: Q(x) -> P(x). forall x: R(x) -> P(x). Therefore forall x: P(x).