Description: See how some equations have one solution, others have no solutions, and still others have infinite solutions. Created by Sal Khan. And before I deal with these equations in particular, let's just remind ourselves about when we might have one or infinite or no solutions. You're going to have one solution if you can, by solving the equation, come up with something like x is equal to some number. Or if we actually were to solve it, we'd get something like x equals 5 or 10 or negative pi.*Teacher Advisor is 100% free.