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The GCF is 7.
The GCF of 28 and 63 is 7.
The GCF of 28, 42 and 63 is 7.The GCF is 7.
3276
The GCF for 91 63 is 7.
91 - 63 = 28
7
The GCF of 28, 84, and 91 is 7.
The GCF of 14, 63 and 91 is 7.