Consider the following premises. For all x_7, x_7 is a scientist or x_7 will climb a mountain. For all x_7, x_7 will not play tennis. There is at least one x_7 for which x_7 is not a scientist or x_7 is happy. For all x_7, if x_7 climbs a mountain, then x_7 is playing tennis. Can we infer the following from them? For all x_7, x_7 is not happy.
 From the fact that for all x_7, x_7 is a scientist or x_7 will climb a mountain, and that there is at least one x_7 for which x_7 is not a scientist or x_7 is happy we can infer that there is at least one x_7 for which x_7 will climb a mountain or x_7 is happy. From the fact that for all x_7, if x_7 climbs a mountain, then x_7 is playing tennis, and that for all x_7, x_7 will not play tennis we can infer that for all x_7, x_7 will not climb a mountain. Finally, from the fact that there is at least one x_7 for which x_7 will climb a mountain or x_7 is happy, and that for all x_7, x_7 will not climb a mountain we can infer that there is at least one x_7 for which x_7 is happy, which contradicts that For all x_7, x_7 is not happy. Therefore, the answer is no.