If that's + 21, the answer is (8x - 3)(8x2 - 7)
If that's - 21, it gets ugly in a hurry.
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The greatest common factor of 18 and 21 is 3.
The Greatest Common Factor of 14 and 21 is 7.
21 can not be divided by 2, ergo it can not be a common factor with 72
21 itself is the greatest common integral factor, since 21 X 2 = 42.
no