It is: 7b+4b-1b = 10b when simplified
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a + 7b + 2c
11a+7b-(3b-2a)
100a2 - 49b2 is the difference of two perfect squares. Therefore, it is equal to the sum times the difference of the roots: (10a + 7b)(10a - 7b)
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6a + (7b - 4a - 8b) = (6a - 4a) + (7b - 8b) = 2a - b