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Alpha Teach Yourself Algebra I in 24 Hours by Jane Cook

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Hour1
Algebraic Expressions
Algebra is simply a language that lets you speak efficiently about numbers and how they relate. For example, when you first learned that “five plus two is seven,” it was probably written like this:
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And when you first learned that “five times two is ten,” it was probably written like this:
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A more efficient way to write these statements is: 5 + 2 = 7 and 5 · 2 = 10. This is algebra at its simplest. What was a math problem has now become an algebraic sentence. It contains the most basic algebraic symbol, the equals sign. ...

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