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Here is a good little trick that you can impress your friends with or even your parents. I
wrote it down so that I don't forget any of the steps. Choose a number. Don't tell anyone
what the number is. Add five to that number, double the result, then subtract four, then
divide by two, the answer that you get here subtract the number that you started with,
and you will always see that the result will always be three and you can check that with
any number.
For example, let's say that the number you chose is nine. Let's add five. We get fourteen.
Let's double that result. That becomes twenty-eight. Let's subtract four. We get twenty-four. Divide
by two. We get twelve and now subtract the number you started with which was nine and
you'll see that you'll get a three. So no matter what number you choose, you'll always
get a three and the reason for that is this is the foundation for algebra. Whatever you
do to one side you do to the other, basic rule in algebra.