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1. The variable(s) parts of like terms are the same. 2. For example, 3xyz and -4xyz are like terms. 3. For adding or subtracting two or more terms, they must be like terms. For example, we cannot add (or simplify) 2x + 2 further as 2x and 2 are NOT like terms. 4. To add or subtract like terms, we will just add or subtract their
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