A slightly different SBI contest #2

In most other contests you just have to give a random comment without thinking, but here I want to do things a bit different.

In every contest I will give you some easy problem and you need to write a comment containing the solution of it.

To give everyone the chance to think about the problem and not just the first commenter I will add an individual component to the problem(You will see how this works when I present the problem).

No upvote/resteem/follow/… required, although that would increase the chance that I can afford to keep up this contest.

I will give away 1 SBI after 48 hours to a random comment containing the correct solution.

Here is another simple math problem. Again i will play an important role:
(x–n)² = -n

Solve for x!

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Wait… But what is n???
n is the individual component I was talking about at the top.
The individual component is just simple your reputation.
If don't know what that is: The reputation is that little number that you can see in brackets behind your name.

Please start your post with n = (whatever your reputation is), to be prepared for the case that your reputation changes.

If your solution involves irrational numbers please round to 3 digits.