Translate the following inference to logic notation: For all x, if x_7 were a taxi driver, then x_7 is a musician. For all x, x_7 is a bartender if and only if x_7 is a musician. There is at least one x for which x_7 is not a soldier or x_7 is a bartender. For all x, x_7 is a soldier or x_7 is a taxi driver. Therefore there is at least one x for which x_7 is a musician.
forall x: P(x) -> Q(x). forall x: R(x) <-> Q(x). exists x: ~S(x) or R(x). forall x: S(x) or P(x). Therefore exists x: Q(x).