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Usually, if simple things won't work, you must start multiplying the numbers to find a least common denominator.
3, 5, 6, 7
Start by multiplying the two largest numbers and seeing if the answer is divisible by the other numbers.
7*6=42 42 is not divisible by 5, so this will not work.
If not, try multiplying the three largest numbers.
7*6*5=210 210 is divisible by all 4 numbers, so this will work
The answer is 210.
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