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Add them together: 2a+5a = 7a
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2a + 11a - 5a = 8a
2a + 4b
2a + 3a + 4 = 5a + 4
5a + 4b - 3a =(5a - 3a) + 4b =2a + 4b =2 (a + 2b)
2a + 5a + 3a = 10a