factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
factors of 18: 1, 2, 3, 6, 9, 18
Then, the greatest common factor is: 6
And the sum can be rewritten as
24 + 18 = 6*4 + 6*3 = 6(4 + 3)
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