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Q: What is 3 over 7 plus 9 over 21?

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1/3 + 2/7 = 7/21 + 6/21 = 13/21

3 over 21

2/7 +2/3 = 6/21 + 14/21 = 20/21

4/7 + 1/3 = get common denominator 12/21 + 7/21 = 19/21 is your answer add

14/21 + 9/21 = 23/21

6/7 + 1/3 = 14/21

It is: 13/21

17 over 21

1/7 + 2/3 is 17/21

Expressed as a proper fraction in its simplest form, 1/7 + 3/21 = 2/7 or two sevenths.

3 over 7 because nothing can get to 2 when your dividing by 9 plus 9/3=3 and 21/3=7 ( / = division)

6/7+1/3 = 25/21

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