Talk:Through a Glass, Darkly/@comment-222.127.85.107-20140830153101/@comment-76.234.41.99-20140830232256

Because they're not following Order Of Operations. They're thinking: 10 + 10 = 20, 20 x 0 = 0, and 0 + 10 = 10. When really it's: 10 x 0 = 0 and 10 + 0 + 10 = 20.