Divide 6 into 72. If the answer has no remainder, 6 is a factor.
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The GCF of 72, 90, and 120 is: 6
The highest common factor of the numbers 30, 60 and 72 is 6.
2(x - 6)(x + 6)
6
Since 12 is a factor of 72, all of its factors are common.