-3 + b/(x - 4) = (-3x + 12 + b)/(x - 4) = (3x - 12 - b)/(4 - x) ≡ 3x/(4 - x)
3x - 12 - b = 3x
b = -12
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-3 + b/(x - 4) = (-3x + 12 + b)/(x - 4) = (3x - 12 - b)/(4 - x) ≡ 3x/(4 - x)
3x - 12 - b = 3x
b = -12