The a-word scares people - just ask your parents! However, it need not be a problem. Think about climbing a tree: as long as you remember to hang on, you won't fall off. Algebra is like that - remember what you're doing, and you'll be fine.
Algebra is all about using letters to represent numbers, then doing stuff with them. This makes life easier - honest!
Let's start with a simple example: x + 2 = 5
The letter x is a number that we don't know. Adding 2 to it makes 5, so what is x? It's 3, of course!