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Try these "Brainpops" and quizzes from Glencoe publishing

Strategy: Distribute, Re-group, Re-order

3x + (- 5) + 7(x + 3) + 5 + (- 3x) << DISTRIBUTE >>

3x + (- 5) + 7x + 21 + 5 + (- 3x) << RE-ORDER >>

3x + (- 3x) + 7x + 21 + 5 + (- 5) << COMBINE >>

7x + 21

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