There's a problem in WikiAnswers; you can't type the slash character "/" in a question, so sometimes we have to guess that you're trying to type in a fraction. Is your question "Is 21/9 equivalent to 7/3?"
If that's your question, then the answer is "Yes". Divide the "21" by 3, and divide the "9" by three, and you get 7/3.
So they are equivalent; in fact, they are equal.
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3/7
7/21=1/3 =3/9=2/6 etc
equivalent fractions for 3/7 = 6/14, 9/21, 12/28...
9/21 is the same as 3/7.
3/7, 9/21