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depends what the value of 'a' is.
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4a + 3a = (4 + 3)a = 7a
-7a + 3a = -4a
2a + 9 = 4a - 19 9 + 19 = 4a - 2a 28 = 2a a = 14
2a*3 = 8+4a 6a = 8+4a 6a-4a = 8 2a = 8 a = 4
14a - 4a + 5a - 3a = 12a