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12a
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6a + (7b - 4a - 8b) = (6a - 4a) + (7b - 8b) = 2a - b
4a+8a = 12a 12a divided by 2 = 6a
10
2a*3 = 8+4a 6a = 8+4a 6a-4a = 8 2a = 8 a = 4
21a - 6a