There's not only some math problem here, but some reading problems as well. Since there are no "()", First you got to do "x" and "/", later you can do "+" and "-".

I try to color code it for those of you who don't come up with 7:
6-1x0+2/2

These red operations are frozen for now. You can't do them until you are done with "x" and "/" left to right.

6-0+1

So only now that there are "+" and "-" you can do them left to right, which adds up to 7.