Translate the following inference to logic notation: For all x, x_7 will drive a car if and only if x_7 will play tennis. For all x, x_7 will play tennis and x_7 will climb a mountain. Therefore for all x, x_7 will drive a car.
forall x: P(x) <-> Q(x). forall x: Q(x) and R(x). Therefore forall x: P(x).