Consider the following premises. For all x_7, x_7 is an artist. There is at least one x_7 for which x_7 will go running if and only if x_7 is an artist. For all x_7, if x_7 were a taxi driver, then x_7 is running. Can we infer the following from them? For all x_7, x_7 will not go running.
 From the fact that there is at least one x_7 for which x_7 will go running if and only if x_7 is an artist we can infer that there is at least one x_7 for which if x_7 were an artist, then x_7 is running. From the fact that for all x_7, x_7 is an artist we can infer that for all x_7, x_7 is an artist or x_7 is a taxi driver. Finally, from the fact that there is at least one x_7 for which if x_7 were an artist, then x_7 is running, that for all x_7, if x_7 were a taxi driver, then x_7 is running, and that for all x_7, x_7 is an artist or x_7 is a taxi driver we can infer that there is at least one x_7 for which x_7 will go running, which contradicts that For all x_7, x_7 will not go running. Therefore, the answer is no.