_:n808f3e8528f44dbd82d09a9ec3aba4fcxb19
<http://schema.org/text>
"Understand the math behind this trick. Clearly no matter what you start with, the answer should come out the same (zero isn't allowed). You can see why this trick works by using a little bit of high school algebra; if you follow the instructions starting with the variable X instead of an actual number, you will see that X is eliminated by adding the example's number 17 (see below)."
<https://www.wikihow.com/Do-a-Cool-Mathematical-Mind-Reading-Trick>