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1. 12a - 4 = 4.3.a - 4.1 = 4 (3.a - 1) = 4 (3a-1)
2. 6a - 8ab = 2.a.3 - 2.a.b.4 = 2.a (3 - b.4) = 2a (3-4b)
3. 8a³ - 24a² = 8.a.a.a - 8.3.a.a = 8.a.a (a-3) = 8a² (a-3)
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