12b - 9 + 2b - b = -87
13b - 9 = -87
13b = -87 +9
13b = -78
b = -6
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4(3b - 5) < -31 + 12b12b - 20 < -31 + 12b, this is not true because -20 > - 31, so that the solution for the given inequality does not exist.
b = 6
A=12b+3 A=-2b--4
No, it is not.
(b + 8)(b + 4)