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x + (-12) = 28 So x = 28 + 12 = 40
The GCF is 14.
28 and 56 have a GCF of 28.
The greatest common factor of 40 and 63 is 1.
4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48