Consider the following premises. For all x_3, if x_3 takes a plane, then x_3 is making tea. For all x_3, if x_3 makes tea, then x_3 is poor. For all x_3, x_3 will take a plane if and only if x_3 is poor. Can we infer the following from them? If we can, name the inference rule being used: For all x_3, x_3 will take a plane if and only if x_3 is poor.
That is one of the premises. Therefore, the answer is yes.