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https://www.mathplanet.com/education/pre-algebra/introducing-algebra/evaluate-expressions

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Combing like terms is an important task to simplify equations. Like terms have the same variables to the same powers.
Ex.
12x+6+3x=15
15x+6=15

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Combining like terms introduction | Introduction to algebra | Algebra I | Khan Academy

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Unknown numbers replaced by any lowercase letter.