9x is a **term**. 9 is the number part and is called a **coefficient**. x is the letter part and is called a **variable**. When a coefficient is combined with a variable, a term is form: 9x

9x and 3x are considered **like terms** because they both have...

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9x is a **term**. 9 is the number part and is called a **coefficient**. x is the letter part and is called a **variable**. When a coefficient is combined with a variable, a term is form: 9x

9x and 3x are considered **like terms** because they both have the same variable. Like terms can be combined by adding the coefficients of the terms. The variable does not change.

9x + 3x = 12x

**Answer: 12x**