If b = 5, 7b = 35
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b2 - 7b - 6b = -4(-4)2 - 7(-4) - 6 = 16 +28 - 6 = 38
If you mean: 7b+b+b then it is 9b simplified
If you mean 7b-2 = -51 then the value of b is -7
-58
6a + (7b - 4a - 8b) = (6a - 4a) + (7b - 8b) = 2a - b