How do I solve this pre algebra problem?

First, you need to convert 12 1/2 to an improper fraction (which would be 25/2). Then you need to rationalize by 10, because that is the least common multiple of 5 and 2. After that you should have 8x > 100. Then, you divide 100/8, which can be simplified and left as 25/2. x > 25/2 is the final answer.