Consider the following premises. For all x_7, if x_7 were a bartender, then x_7 is taking a plane. There is at least one x_7 for which x_7 will work. For all x_7, x_7 is a bartender and x_7 will make tea. Can we infer the following from them? If we can, name the inference rule being used: For all x_7, either x_7 will take a plane or x_7 will work are not true.
That contradicts the premises. Therefore the answer is no.