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dogewarrior187
The common denominater for the question is 35. Multiply 7 x 5 because in this case, they have no number before that which is common.
brilliantBrunette
A possible common denominator are ->   21/35 and 20/35.    

I just multiplied the denominators by each other, if I can't find another way. 
I would multiply five times sevon, to get 35, and then do the same to the numorator, getting 21. Then I would multiply sevon by five, getting 35, and then do the same to the numorator, getting 20. 

I hope this helps! XD

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