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"Like terms" are terms whose variables (and their exponents such as the 2 in x2) are the same. In other words, terms that are "like" each other.
When you have an expression consisting of several terms added together, and they are not all like terms, and there are like terms separated by unlike terms, you use the commutative law of addition to rearrange the terms so that the like terms are next to each other.
When the independent variable is of the same degree. Ex. 3x and -5x are like terms. 6 and 9 are like terms. 7x^2 and 9x^3 are NOT like terms.
Like terms
They are known as like terms.