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28
28 is the LCD
20
The LCD for 4/7 and 7/8 is 56.
28.
The LCD for 3/4 and 4/7 is 28.
The LCD for 4/7 and 3/5 is 35.
8.
8
21
60
K/3 + k/4 = 1 LCD=12 *divide lcd by denominator* K(4) + K(3) = 12(1) 4k + 3k = 12 7k = 12 k=12/7