In the exam I cheated; copied from your paper. My grade will be better than yours, because you wrote eights fallen; I made your eights straight up in my paper.
When 8 falls down it becomes infinity. In the original paper, infinity is written. But the cheating guy thinks it is actually 8 but it has fallen down and has become a bad version of 8. The cheating guy corrected the problem and made it correct 8. Note that the intention in the original paper is infinity, cheating guy has never seen infinity before, and thought that it is an incorrect version of 8. This lets him believe that he would get a better grade.
When 8 falls down it becomes infinity. In the original paper, infinity is written. But the cheating guy thinks it is actually 8 but it has fallen down and has become a bad version of 8. The cheating guy corrected the problem and made it correct 8. Note that the intention in the original paper is infinity, cheating guy has never seen infinity before, and thought that it is an incorrect version of 8. This lets him believe that he would get a better grade.