Consider the following premises. For all x_3, if x_3 makes tea, then x_3 is a politician. For all x_3, x_3 will not make tea. For all x_3, x_3 will make tea or x_3 is not a politician. Can we infer the following from them? For all x_3, x_3 is not a politician.
 From the fact that for all x_3, x_3 will make tea or x_3 is not a politician we can infer that for all x_3, if x_3 were a politician, then x_3 is making tea. From the fact that for all x_3, if x_3 makes tea, then x_3 is a politician, and that for all x_3, if x_3 were a politician, then x_3 is making tea we can infer that for all x_3, x_3 will make tea if and only if x_3 is a politician. Finally, from the fact that for all x_3, x_3 will make tea if and only if x_3 is a politician, and that for all x_3, x_3 will not make tea we can infer that for all x_3, x_3 is not a politician. Therefore, the answer is yes.