Answer:
21
Step-by-step explanation:
Given that the denominator of each fraction is 3, 7, and 21.
To find the LCD, prime factorize each number and take the highest power of each prime number then multiply.
Observe that:
3 = 3¹
7 = 7¹
21 = 3¹ x 7¹
Thus, the LCD is 3¹ x 7¹ = 3 x 7 = 21.
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~~DeanGD20
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