Consider the following premises. For all x_7, x_7 will drive a car. For all x_7, if x_7 were a politician, then x_7 is an electrician. For all x_7, x_7 will drive a car if and only if x_7 is a politician. Can we infer the following from them? There is at least one x_7 for which x_7 is not an electrician.
 From the fact that for all x_7, x_7 will drive a car if and only if x_7 is a politician we can infer that for all x_7, if x_7 drives a car, then x_7 is a politician. From the fact that for all x_7, if x_7 drives a car, then x_7 is a politician, and that for all x_7, x_7 will drive a car we can infer that for all x_7, x_7 is a politician. Finally, from the fact that for all x_7, if x_7 were a politician, then x_7 is an electrician, and that for all x_7, x_7 is a politician we can infer that for all x_7, x_7 is an electrician, which contradicts that There is at least one x_7 for which x_7 is not an electrician. Therefore, the answer is no.