Consider the following premises. For all x_7, x_7 will drink water. There is at least one x_7 for which x_7 will play tennis. For all x_7, x_7 will not drink water. Can we infer the following from them? If we can, name the inference rule being used: There is at least one x_7 for which x_7 will play tennis.
That is one of the premises. Therefore, the answer is yes.