Note that always.

If then and so .

We know that cannot be such a number which makes this true - thus we will look at all other numbers to solve this.

Divide by to get .

Case 1:Both . This means that this combines into just saying .

Case 2:Both . This means that this combines into just saying .

This gives us an answer that .

But that is not quite right because remember we said . Thus we need to take that point out of this solution set. Thus, the correct answer is .