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LCD(28, 56) = 56.
4536
1512
56
It is: 728
1064
As 2 is a factor of 56, lcd(2, 56) = 56.
The LCM is 952.
1/7 + 3/8 = 8/56 + 21/56 is the lowest common denominator.
LCD(8, 7) = 56.