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f(8) = (3+b)8 + 15 = -9
= 24 + 8b = -9 - 15
= 8b = -24 - 24
= b = -48/8 = -6
24 + 8b + 15= -9
39 + 8b = -9
8b = -9-39
8b = -48
b = -48 / 8
b = -6