dgfgrafgdfge111

Oh, I get it now. I see. Thanks a lot for your help (and time)!!!

How did you get that? And what is that notation?

Wait, how did you get the first summation? Is there a formula or something?

- x - = +

So, looking at the negatives (there are 5 on the left side), we get -10x = -5. Then, dividing by -10 results in x = -5/(-10) = 1/2.

Actually, the answer key says it is 1. Do you know how?

Wow, You can also make a circle. I had no idea.

Here's the diagram I think you're talking about.