What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, if x_7 were rich, then x_7 is listening to a song. For all x_7, x_7 will play tennis or x_7 will take a plane. For all x_7, x_7 will play tennis if and only if x_7 is rich. For all x_7, if x_7 takes a plane, then x_7 is listening to a song.
For all x_7, if x_7 plays tennis, then x_7 is rich. For all x_7, if x_7 were rich, then x_7 is playing tennis.