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Q: What is 2-1?

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(21-21)+(21-21)+21 = 0+0+21 = 21

The LCM is 21.

21

21*1 = 21

21-21 = 0

the lcm of 3 and 7 is 21 and the lcm of 7 and 21 is 21, so the lcm of 3, 7 and 21 is the lcm of 21 and 21 which is 21.

21 = 21

21*21 = 441 square feet.21*21 = 441 square feet.21*21 = 441 square feet.21*21 = 441 square feet.

5/7 - 5/21 = 15/21 - 5/21 = 10/215/7 - 5/21 = 15/21 - 5/21 = 10/215/7 - 5/21 = 15/21 - 5/21 = 10/215/7 - 5/21 = 15/21 - 5/21 = 10/21

21

21 + 21 = 42.

21 x 21 = 441