Consider the following premises. William is bored if and only if David is making tea. If David were a mechanic, then William is bored. For all x_8, x_8 is a mechanic or x_8 will make tea. Can we infer the following from them? If we can, name the inference rule being used: For all x_8, x_8 is a mechanic or x_8 will make tea.
That is one of the premises. Therefore, the answer is yes.