There a couple of resolution strategies depending on what "inequitably paid in a job" means:
1) If it means that you are not paid fairly within your company compared to other people doing the same job, then that is something that you will need to discuss with your supervisor and possibly HR. The first thing to do would be to find out if your job has a specific designation or grade within the company. If it does, then you should ask HR what the pay scale is for that particular grade. Then, you need to reflect on how long you have been in the company, how many years of experience you have outstide the company, etc. It does not do any good to go into a discussion with your boss and/or HR and try to compare yourself to a specific person. Try to ask general questions regarding the median amount of pay in that job grade within the company and then see where you compare to that number. In some cases, HR may not be required to provide this information to you. In these cases, you will have to have a more generalized discussion on what would be required to move up within the pay grade, etc.
2) If you are not paid equitably to other people within the same field, but not in your company, then this is an easier discussion to have but a harder task to get anything changed. The best approach would be to look for median and ranges of pay for your position within all industries or within the same industry. Also, if you are required to have a specialized degree or training, try to find information about ranges and medians for these degrees as well. It would probably be a long process to get changes, but this is something you would need to work with HR, rather than your supervisor, to address.