Consider the following premises. For all x_11, x_11 will make tea if and only if x_11 is a mechanic. For all x_11, x_11 will make tea if and only if x_11 is a mechanic. Can we infer the following from them? If we can, name the inference rule being used: For all x_11, x_11 will make tea if and only if x_11 is a mechanic.
That is one of the premises. Therefore, the answer is yes.