Translate the following inference to logic notation: For all x, x_11 will make tea if and only if x_11 is an electrician. For all x, x_11 will make tea if and only if x_11 is an electrician. Therefore if Charles makes tea, then Charles is an electrician.
forall x: P(x) <-> Q(x). forall x: P(x) <-> Q(x). Therefore P(a) -> Q(a).