Translate the following inference to logic notation: For all x, x_7 is a soldier or x_7 will drink water. For all x, x_7 will not play squash. For all x, x_7 is a soldier if and only if x_7 will play squash. Therefore for all x, x_7 will drink water.
forall x: P(x) or Q(x). forall x: ~R(x). forall x: P(x) <-> R(x). Therefore forall x: Q(x).