70 would be the lowest common denominator
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The Least Common Multiple (LCM) for 2 5 7 9 is 630.
2310
The least common multiple of 4 , 5 , 3 , 7 = 420
The lowest common multiple of 5 and 7 is 35.
84=2*2*3*7105=5*3*7147=3*7*73*7*2*2*5*7=2940