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Try these "Brainpops" and quizzes from Glencoe publishing

Commutative Property (order doesn't matter) QuikChek
Associative Property (grouping doesn't matter)
Distributive Property QuikChek
Solving One-Step Equations QuikChekI/QuikChekII
Solving Two-Step Equations QuikChek

 

 

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Answer:  7x + 21

 

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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