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Answers by Kate D.

3x+9x+7x+5x= (answer)

3x+9x+7x+5x= Since all the terms are "like" terms, you can add the numbers together, 3+9+7+5 (I do this by combining the 7+3 to make 10, then combine 9+5 to make 14, lastly add the two sums together - 10+14=24).  So the sum of the 4 numbers...