The lowest common denominator of 7 and 1 is 7.
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Lcd = 1 Lcm = 112
The LCD of any two (or more) of positive integers is 1
The LCD is 36
20
Assuming you mean the LCM (Least Common Denominator of 2 fractions is the LCM of the denominators, which for 7/1 and 16/1 is 1), the answer is 112.