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2a + 4b
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Add them together: 2a+5a = 7a
2a + 11a - 5a = 8a
-6(a-3b-9c)
5a + 4b - 3a =(5a - 3a) + 4b =2a + 4b =2 (a + 2b)
3a4 - 2a2 + 5a - 10 - 2a4 + 4a2 + 5a - 2 = a4 + 2a2 + 10a - 12 = a4 + (2a - 2)(a + 6)