You can put this solution on YOUR website! I'm not sure you stated this problem the way you meant for it to be stated, and I may be way off base with this, but I'm going to try it anyway. I think the problem you meant to ask is. Tell me if this is what you meant to ask?
If so, then remember that and that . Put these together and you have
This last statement in reverse, using "e" to replace the x, looks like this: