SOLUTION: Which expression uses the commutative property of addition to make an expression equivalent to 3x+4x+9?

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Question 649946: Which expression uses the commutative property of addition to make an expression equivalent to 3x+4x+9?
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
Think of commutative as in terms of driving to school and returning back home.
The distance both ways is the same on the "commute."
...
9 + 4x + 3x = 3x + 4x + 9
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