Translate the following inference to logic notation: For all x, x_7 will not read a book. There is at least one x for which x_7 is sad or x_7 will not work. For all x, x_7 will read a book or x_7 will work. Therefore there is at least one x for which x_7 is sad.
forall x: ~P(x). exists x: Q(x) or ~R(x). forall x: P(x) or R(x). Therefore exists x: Q(x).