1. Square both sides

2. Subtract x from both sides

3. Divide by 1999

4. Square both sides

5. Simplify lefthand side

6. Subtract x

7. Common denominator and combine fractions

8. Divide by 1999

9. Square both sides

10. FOIL it out

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um, not going to finish, I just realized that this is annoying, and I am probably going to make a math error at some point, throwing the whole thing off. So I decided to look at the problem from a "is there an obvious answer" approach instead of a "how would I solve this" approach, and yes,the obvious answer is zero.