divide the top and bottom by 7. The result is 1/3.
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21
You can simplify 7/21 by dividing both sides by 7 to get 1/3
21 : 6factor out a 33(7 : 2)7 : 2==========simplified ratio
12/21 = 4/7 in its simplest form
21 and 35 are both divisible by 7 21/35 = 3/5