## Introduction...

Just to start off, we need to know what

__variables__are. Well, here's the best way to put it:__Variable:__A variable is a quantity that can change or vary and is often represented with a letter.

What that means is that in algebra, we can represent numbers as letters!

## How To Write Expressions With Variables...

Well, when you are expressing any situation in algebra, you will need to use variables. Let's take a look at an example of such a situation. So, let's say that we have 23+46=69 and we have to replace 69 with a variable. Remember that variables are just letters, so that means that we can just simply take any one of the twenty-six letters, and replace it with 69. Usually, the variable will be x, but not always! I will use r, for this case. That means that our now algebraic expression is:

23+46= r!

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