Simplify:

3x - 5 + 7(x + 3) + 5 - 3x

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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