Combine Like Terms with Negatives: https://www.khanacademy.org/math/algebra/introductiontoalgebra/alg1manipulatingexpressions/e/combining_like_terms_1 Combine Like Terms and Distribution:
https://www.khanacademy.org/math/algebra/introductiontoalgebra/alg1manipulatingexpressions/e/combining_like_terms_2
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