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Add the like terms. (2x2 - 4) + (x2 + 3x - 3) = 2x2 - 4 + x2 + 3x - 3.. identify like terms = 2x2 + x2 + 3x - 4 - 3.. group the like terms together = 3x2 + 3x - 7... add the like terms

+ x2 + 3x - 3

3x2 + 3x - 7