It is 70
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The Least Common Denominator of 5, 7, and 35 is 1.
7
7.
84/14 = 6 84/7 = 12 84/3 = 28 Hence 84 is the least common denominator
5/7 - 7/14 becomes: 10/14 - 7/14. Then subtract across to get the final answer: 3/14. 5/7 became 10/14 by finding the lowest common denominator which is 14. Then you figure 7 goes into 14 two times, and 2x5 = 10 therefore 5/7 becomes 10/14.