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3/7+ 9/21 is equal to (3x3)/(7x3) + 9/21 which is equal to 9/21 + 9/21 , because both denominators are the same you can simply add the two numerators which then becomes 18/21 , then yo can cancel it down to 6/7

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โˆ™ 2012-02-09 20:05:59
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Q: What is 3 over 7 plus 9 over 21?
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