Let's first simplify the given equation step-by-step:
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Combine like terms on the left side: \[ 3 - 15x + 24 + 16x = (3 + 24) + (-15x + 16x) = 27 + x \]
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On the right side, we have: \[ 4x - 24 - 4x = 0 - 24 = -24 \]
Now, the equation is simplified to: \[ 27 + x = -24 \]
Next, to isolate \(x\), the next best step is to subtract 27 from both sides: \[ x = -24 - 27 \]
Thus, the correct next step among the options provided is: Subtract 27 from both sides of the equation.