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Anonymous
12: 1, 2, 3, 4, 6, 12
30: 1, 2, 3, 5, 6, 10, 15, 30
12 + 30 = 42
42: 1, 2, 3, 6, 7, 14, 21, 42
12x + 30 = 6(2x + 5)
12 + 30x = 6(5x + 2)
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