I can actually...been doing it since HS (mid-90's). We had a Korean algebra teacher that was the MASTER at it. He told us if we could demonstrate it by the end of the second semester, we got extra-credit. lol...
It just takes lots and lots of practice. BUT beware...once you figure it out, its highly addicting. I cannot hold a pen/pencil in my hands w/o doing it. Drives others crazy. Good luck!
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I too am useless at this.