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11a+7b-(3b-2a)
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6a + (7b - 4a - 8b) = (6a - 4a) + (7b - 8b) = 2a - b
a + 7b + 2c
-58
It is: 7b+4b-1b = 10b when simplified
a = b + 9; 4a = 7b so 4 x (b + 9) = 7b, ie 4b + 36 = 7b so b = 12 and a = 21