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