Translate the following inference to logic notation: For all x, x_7 is a lawyer if and only if x_7 will play tennis. For all x, x_7 will play tennis if and only if x_7 is an electrician. Therefore for all x, if x_7 were a lawyer, then x_7 is an electrician.
forall x: P(x) <-> Q(x). forall x: Q(x) <-> R(x). Therefore forall x: P(x) -> R(x).